Kawasaki Satoru(Faculty of Engineering　Sustainable Resources Engineering　Geoenvironmental Engineering)｜ Hokkaido University Researchers (Hokkaido University Researchers Directory)

Name

AuthorName

Position

Affiliation

Research Field

Kawasaki Satoru

Faculty of Engineering　Sustainable Resources Engineering　Geoenvironmental Engineering

Professor

Last Updated :2025/11/06

■Researcher basic information

Degree

Ph.D., Tottori University, Mar. 1999

M.Eng., Tottori University, Mar. 1988

Researchmap personal page

https://researchmap.jp/read0054792

Home Page URL

https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200901051444653746

https://rml.eng.hokudai.ac.jp/

https://rml.eng.hokudai.ac.jp/home_eng.html

Researcher number

00304022

J-Global ID

200901051444653746

Research Keyword

microorganism

silica

calcium phosphate compound

calcium carbonate

soft rock

beachrock

ground improvement

engineering geology

test method

new material

property evaluation

mechanical property

non-destructive test

biogrout

preservation material

Research Field

Energy, Earth resource engineering, energy science

Social infrastructure (civil Engineering, architecture, disaster prevention), Geotechnical engineering

Humanities & social sciences, Museology

Humanities & social sciences, Cultural properties

Educational Organization

Bachelor's degree program, School of Engineering

Master's degree program, Graduate School of Engineering

Doctoral (PhD) degree program, Graduate School of Engineering

■Career

Career

Apr. 2014 - Present
Hokkaido University (Division of Sustainable Resources Engineering), Professor

Apr. 2010 - Mar. 2014
Hokkaido University (Division of Sustainable Resources Engineering), Associate Professor

Apr. 2007 - Mar. 2010
Hokkaido University (Division of Field Engineering for Environment), Associate Professor

Dec. 2006 - Mar. 2007
Gifu University (Department of Civil Engineering), Assistant Professor (part-time)

Apr. 2005 - Mar. 2007
Hokkaido University (Division of Field Engineering for Environment), Associate Professor

May 2002 - Mar. 2005
Hokkaido University (Division of Environment and Resources Engineering), Associate Professor

Feb. 2000 - Apr. 2002
Osaka University (Division of Global Architecture), Assistant Professor

Jun. 2001 - Sep. 2001
Gifu University (Department of Civil Engineering), Assistant Professor (part-time)

Apr. 1998 - Jan. 2000
Osaka University (Division of Global Architecture), Research Associate

Mar. 1998 - Mar. 1998
Osaka University (Department of Civil Engineering), Research associate

Jan. 1997 - Feb. 1998
Central Research Institute of Electric Power Industry, Chief Researcher

Aug. 1995 - Dec. 1996
Central Research Institute of Electric Power Industry, Senior Researcher

Aug. 1990 - Jul. 1995
Central Research Institute of Electric Power Industry, Researcher

Apr. 1988 - Jul. 1990
Central Research Institute of Electric Power Industry, Assistant Reseacher

Educational Background

Apr. 1997 - Mar. 1999, Tottori University, Graduate School of Engineering, Engineering of Social Development, Japan

Apr. 1986 - Mar. 1988, Tottori University, Graduate School of Engineering, 海洋土木工学専攻修士課程, Japan

Apr. 1982 - Mar. 1986, Tottori University, Faculty of Engineering, Department of Civil Engineering, Japan

Committee Memberships

2025 - Present
斜里町遺跡調査活用検討委員会, 委員, Autonomy

2010 - Present
北海道開発局, 道路防災有識者, Government

2004 - Present
土木学会岩盤力学委員会, 委員, Society

2003 - Present
資源・素材学会岩盤工学部門委員会, 委員, Society

2003 - Present
資源・素材学会北海道支部, 常議員, Society

2023 - 2025
日本生物工学会, 代議員, Society

2019 - 2023
土木学会, 岩盤力学委員会岩盤力学改訂版編集小委員会執筆者執筆委員, Society

2017 - 2022
北海道環境保全技術協会, 北海道新幹線、新函館北斗・札幌間自然由来重金属等掘削土対策検討委員会委員, Society

2015 - 2022
札幌市, 廃棄物処理施設設置等評価委員会委員, Autonomy

2018 - 2020
札幌市, 環境影響評価審議会会長, Autonomy

2018 - 2020
資源・素材学会北海道支部, 支部長, Society

2018 - 2020
資源・素材学会, 理事, Society

2017 - 2020
地盤工学会, 次世代地盤改良技術に関する研究委員会委員, Society

2016 - 2020
地盤工学会, 室内試験規格・基準委員会 WG1：物理特性メンバー, Society

2017 - 2019
北海道環境保全技術協会, 北海道新幹線、新函館北斗・札幌間自然由来重金属等掘削土対策検討委員会幹事会幹事, Society

2015 - 2019
日本材料学会, 代議員, Society

1998 - 2019
日本材料学会岩石力学部門委員会, 委員, Society

2014 - 2018
札幌市, 環境影響評価審議会委員, Autonomy

2013 - 2018
ICE Publishing, International Editorial Board of Environmental Geotechnics Editorial Board Member, Society

2014 - 2017
地盤工学会, 地盤調査および室内試験基準の英訳化に関する実行委員会委員, Society

2014 - 2016
土木学会, 土木学会論文集編集委員会C分冊編集小委員会委員, Society

2013 - 2016
地盤工学会, 室内試験規格・基準委員会委員長, Society

2013 - 2015
ASEAN Engineering Journal Editorial Broad Member in Geological and Geo-Resource Engineering, Government

2014 - 2014
資源・素材学会, Journal of MMIJ編集委員会委員, Society

2012 - 2014
2014 ISRM International Symposium ARMS8 (The 8th Asian Rock Mechanics Symposium), Organizing Committee Vice Secretary General, Society

2012 - 2014
岩の力学連合会, 第8回アジア地域岩の力学シンポジウム（ARMS）組織委員会委員兼副幹事長, Society

2008 - 2014
地盤工学会北海道支部, 幹事, Society

2012 - 2013
資源・素材学会 Journal of MMIJ編集委員会, 編集幹事, Society

2011 - 2013
地盤工学会, 室内試験規格・基準委員会岩石の繰返し強度試験方法基準化WG メンバー, Society

2010 - 2011
資源・素材学会 Journal of MMIJ編集委員会, 委員, Society

2009 - 2011
土木学会, 教育企画・人材育成委員会大学・大学院小委員会委員, Society

2009 - 2011
地盤工学会, 室内試験規格・基準委員会岩石および岩盤不連続面の動的繰返し強度・変形試験方法基準化検討WG メンバー, Society

2006 - 2010
北海道道路管理技術センター, 道路防災ドクター, Government

2006 - 2009
地盤工学会, 室内試験規格・基準委員会 WG11：赤本改訂版の総説執筆 WG幹事, Society

2006 - 2009
地盤工学会, 室内試験規格・基準委員会 WG1：物理特性メンバー, Society

2006 - 2009
地盤工学会, 室内試験規格・基準委員会委員兼幹事, Society

2006 - 2009
地盤工学会, 基準部部員, Society

2005 - 2009
岩の力学連合会, 電子ジャーナル委員会編集委員兼幹事, Society

2006 - 2007
岩の力学連合会, 企画委員会委員, Society

2006 - 2007
岩の力学連合会, ISRM2007コングレス国内審査委員会委員, Society

2004 - 2006
土木学会, 岩盤力学委員会論文小委員会委員長, Society

2004 - 2006
土木学会, 論文賞選考委員会委員, Society

2004 - 2006
地盤工学会, 岩石のスレーキング試験方法基準化委員会委員長, Society

2002 - 2006
地盤工学会, 岩の試験・調査規格・基準検討委員会委員, Society

1998 - 2006
土木学会, 岩盤力学委員会運営小委員会委員, Society

2004 - 2005
岩の力学連合会, 賞表彰委員会委員, Society

2003 - 2005
土木学会, 岩盤力学委員会企画小委員会委員, Society

2002 - 2005
資源・素材学会北海道支部, 幹事, Society

1996 - 2004
土木学会, 岩盤力学委員会論文小委員会委員, Society

2002 - 2003
土木学会, 岩盤力学委員会論文小委員会幹事, Society

2001 - 2003
The Third International Symposium on Rock Stress (RS Kumamoto '03) Organizing Committee, Member, Society

2001 - 2003
地盤工学会岩盤のせん断試験方法基準化委員会, 委員, Society

2001 - 2002
土木学会, トンネル工学委員会トンネル工学研究発表会小委員会委員兼幹事, Society

2001 - 2002
地盤工学会, 第31回地盤工学研究発表会実行委員会研究発表講演部会委員, Society

2000 - 2002
岩の力学連合会, 第11回岩の力学国内シンポジウム運営委員会委員, Society

2000 - 2002
地盤工学会, 軟岩の圧密非排水（CU，CUバー）三軸圧縮試験方法基準化委員会委員兼幹事, Society

1999 - 2002
地盤工学会関西支部, 幹事, Society

1999 - 2002
土木学会岩盤力学委員会深地層における軟岩の評価に関する研究小委員会, 委員兼幹事, Society

1998 - 2002
日本建設機械化協会関西支部, 技術部会トンネル施工機材委員会委員兼幹事, Society

1998 - 2000
土木学会岩盤力学委員会軟岩小委員会, 委員兼幹事, Society

1998 - 2000
地盤工学会岩の三軸圧縮試験方法基準化委員会, 委員, Society

1995 - 1998
地盤工学会, 土質試験基準検討委員会委員, Society

1995 - 1998
地盤工学会, 土質試験基準検討委員会せん断試験小委員会委員, Society

1995 - 1998
地盤工学会, 土の一面せん断試験方法基準化委員会委員, Society

1995 - 1998
地盤工学会岩石の超音波速度測定方法基準化委員会, 委員兼幹事, Society

1990 - 1998
土木学会岩盤力学委員会軟岩小委員会, 委員, Society

1992 - 1994
土質工学会, 大深度地下利用に関する地盤工学研究委員会委員, Society

■Research activity information

Awards

Nov. 2021, The GEOMATE International Society, The Eleventh International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2021) Best Paper Award

Nov. 2018, The GEOMATE International Society, The Eighth International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2018) Best Paper Award

Feb. 2016, Hokkaido University, Hokkaido University President's Award for Outstanding Education　　　　　　　　　　　　　　　
KAWASAKI Satoru

Nov. 2012, The GEOMATE International Society, The Second International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2012) Keynote Paper Award　　　　　　　　　　　　　　　
KAWASAKI Satoru

Jun. 2012, Japanese Geotechnical Society, FY2011 Paper Awards (Japanese section) of Japanese Geotechnical Society　　　　　　　　　　　　　　　
Japan

May 2008, Japan Society of Engineering Geology, The 18th Paper Awards of Japan Society of Engineering geology　　　　　　　　　　　　　　　
Kawasaki, S, Japan

Papers

Development of acid mine drainage treatment process using arsenic adsorbing bacteria　　　　　　　　　　　　　　　
Sohei Iwama, Chikara Takano, Satoru Kawasaki, Kazunori Nakashima
Journal of Environmental Chemical Engineering, 13, 6, Dec. 2025, [Peer-reviewed]
English, Scientific journal

Metal tolerance and recovery mechanisms of Priestia sp. Mn7 under pH 1.5　　　　　　　　　　　　　　　
Chikara Takano, Kazunori Nakashima, Hideki Aoyagi, Takaaki Kojima, Satoru Kawasaki
Extremophiles, 29, 3, 37, Oct. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Protein- and polysaccharide-based heavy metal removal materials: batch and continuous systems　　　　　　　　　　　　　　　
Chikara Takano, Yuki Shigemasa, Kousuke Aoki, Ilham Maulidin, Satoru Kawasaki, Kazunori Nakashima
ACS Sustainable Resource Management, Oct. 2025, [Peer-reviewed]
English, Scientific journal

An overview on lunar regolith simulants solidification methods: integrating chemical, physical, and MICP strategies for extraterrestrial construction　　　　　　　　　　　　　　　
Yuru Chen, Angran Tian, Gyeongjo Min, Daisuke Fukuda, Satoru Kawasaki
Biogeotechnics, Oct. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Cellulose-polyphenol bioadsorbents for sustainable water pollutant removal　　　　　　　　　　　　　　　
Maulidin I., Takano C., Kawasaki S., Nakashima K.
Proceedings of the 9th International Symposium on Earth Resources Management and Environment (ISERME 2025), Sep. 2025, [Peer-reviewed]
English, International conference proceedings

Development of a Split Hopkinson Pressure Bar (SHPB) system for dynamic rock fracture testing with integrated electromagnetic radiation (EMR) monitoring　　　　　　　　　　　　　　　
Min G., Sen N., Fukuda D., Cho S., Kawamura Y., Kodama J., Kawasaki S.
Proceedings of the 9th International Symposium on Earth Resources Management and Environment (ISERME 2025), Sep. 2025, [Peer-reviewed], [Last author]
English, International conference proceedings

Study of rock anisotropic effects on mode II fracture toughness at various loading rates　　　　　　　　　　　　　　　
Ichikawa K., Min G., Fukuda D., Kawasaki S., Kodama J., Cho S.
Proceedings of the 9th International Symposium on Earth Resources Management and Environment (ISERME 2025), Sep. 2025, [Peer-reviewed]
English, International conference proceedings

Geographical distribution and cementation characteristics of beachrocks in the tropical Asian region　　　　　　　　　　　　　　　
Rahubadda Kankanamge Hiroshima Surangani, Anjula Buddhika Nayomi Dassanayake, Chulantha Lakmal Jayawardena, Niki Evelpidou, Satoru Kawasaki
International Journal of Earth Sciences, Sep. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Efficient reduction of coarse sand permeability by waste shellfish powder-assisted enzyme-induced carbonate precipitation　　　　　　　　　　　　　　　
Zhen Yan, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Acta Geotechnica, Sep. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

In situ mineral formation on a plate for direct and efficient screening of bacteria suitable for biocementation　　　　　　　　　　　　　　　
Kazunori Nakashima, Yuta Sugawara, Masahiro Fujita, Aya Yaegashi, Meiqi Chen, Sivakumar Gowthaman, Thiloththama H. K. Nawarathna, Wilson Mwandira, Numbi Ramudu Kamini, Parthasarathy Baskaran Sujiritha, Chikara Takano, Satoru Kawasaki
Scientific Reports, 15, 18706, May 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Review of in situ resource utilization-based biocementation and regolith consolidation techniques for space applications　　　　　　　　　　　　　　　
Zhen Yan, Satoru Kawasaki
Buildings, 15, 11, 1815, May 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Effects of non-uniform distribution of calcium carbonate in sand column by enzyme induced calcite precipitation using discrete element method　　　　　　　　　　　　　　　
Yuru Chen, Qi Xu, Qiang Tang, Satoru Kawasaki
Proceedings of the 1st International Conference on Bio-mediated and Bio-inspired Geotechnics (ICBBG) 2025, May 2025, [Peer-reviewed], [Last author]
English, International conference proceedings

Mussel adhesive protein-assisted magnetic recovery of microplastics from aquatic environments
Anju Pilakka Veedu, Kazunori Nakashima, Takahiro Sato, Ami Sasabe, Keita Suzuki, Chikara Takano, Satoru Kawasaki
ACS ES&T Water, 5, 5, 2087, 2095, American Chemical Society (ACS), 07 Apr. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Bacterial metal accumulation under strongly acidic conditions for electronic waste recycling　　　　　　　　　　　　　　　
Takano C., Nakashima K., Kawasaki S.
New Biotechnology, 85, 153, Mar. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Enhancing biocement performance via brushite-to-hydroxyapatite transformation from waste bones
Zhen Yan, Maksym Avramenko, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Acta Geotechnica, 20, 2721, 2732, Mar. 2025, [Peer-reviewed], [Last author]
English, Scientific journal, 36907423

Exploration of ureolytic airborne bacteria for biocementation applications from different climate zones in Japan　　　　　　　　　　　　　　　
Meiqi Chen, Chikara Takano, Kazunori Nakashima, Sivakumar Gowthaman, Satoru Kawasaki
Scientific Reports, 15, 7536, Mar. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Physical and chemical properties of solidified cultivating soil blended with waste woody biomass prepared by the EICP method　　　　　　　　　　　　　　　
Daiki Kawamura, Satoru Kawasaki
Journal of the Society of Materials Science, Japan, 74, 3, 161, 166, Mar. 2025, [Peer-reviewed], [Last author]
Japanese, Scientific journal

Green biocement utilizing enzyme-induced carbonate precipitation with waste coffee grounds　　　　　　　　　　　　　　　
Zhen Yan, Maksym Avramenko, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Waste and Biomass Valorization, 16, 5089, 5101, Feb. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Strategies for cost-optimized biocement production: a comprehensive review
Zhen Yan, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
World Journal of Microbiology and Biotechnology, 41, 2, 67, Feb. 2025, [Peer-reviewed], [Last author]
English, Scientific journal, 36907423

Arsenic removal from acid mine drainage using acid-tolerant bacteria　　　　　　　　　　　　　　　
Sohei Iwama, Chikara Takano, Kazunori Nakashima, Hideki Aoyagi, Satoru Kawasaki
CLEAN: Soil, Air, Water, 53, 1, e70000, Jan. 2025, [Peer-reviewed], [Last author]
English, Scientific journal

Kitchen waste bone-driven enzyme-induced calcium phosphate precipitation under microgravity for space biocementation
Zhen Yan, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Biogeotechnics, Dec. 2024, [Peer-reviewed], [Last author]
English, Scientific journal, 36907423

Feasibility study of alternative low-cost cementation media and tempeh starter for the MICP process　　　　　　　　　　　　　　　
Lutfian R., Daryono, Gamaralale, G. N., N. Amarakoon, Tomohiko Abe, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the 10th Asian Young Geotechnical Engineers Conference and 28th Annual International Conference on Geotechnical Engineering, 37, 56, Nov. 2024, [Peer-reviewed], [Last author]
English, International conference proceedings

Utilisation of acid-tolerant bacteria for base metal recovery under strongly acidic conditions　　　　　　　　　　　　　　　
Chikara Takano, Kazunori Nakashima, Satoru Kawasaki, Hideki Aoyagi
Extremophiles, 28, 45, Sep. 2024, [Peer-reviewed]
English, Scientific journal

Development of a numerical simulation method for complex fracture process of rocks based on 3-D ECZM-FDEM using GPGPU parallel computation　　　　　　　　　　　　　　　
Keigo Takarada, Daisuke Fukuda, Wu Di, Hong Liu, Sho Ogata, Yutaro Maeda, Gyeongjo Min, Satoru Kawasaki
Abstract Book of International Symposium on Earth Resources Management and Environment (ISERME 2024), Sep. 2024, [Peer-reviewed], [Last author]
English, International conference proceedings

Experimental and numerical analysis of dynamic fracture processes in rock and rock-like materials using NRC vapor pressure agent　　　　　　　　　　　　　　　
Gyeongjo Min, Daisuke Fukuda, Wu Di, Hong Liu, Satoru Kawasaki, Sangho Cho
Abstract Book of International Symposium on Earth Resources Management and Environment (ISERME 2024), Sep. 2024, [Peer-reviewed]
English, International conference proceedings

Enzymatically mediated precipitation of calcium phosphate compounds: a promising approach for sustainable soil enhancement
M. Avramenko, K. Nakashima, C. Takano, S. Kawasaki
Proceedings of the XVIII European Conference on Soil Mechanics and Geotechnical Engineering, 2085, 2088, Aug. 2024, [Peer-reviewed], [Last author]
English, International conference proceedings, 36907423

Utilizing magnesium carbonate induced by CO2 to modify the performance of plastic clay　　　　　　　　　　　　　　　
Hadi Mohamadzadeh Romiani, Hamed Abdeh Keykha, Saeed Chegini, Afshin Asadi, Satoru Kawasaki
Minerals, 14, 9, 876, Aug. 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Proposing a new sustainable approach for sand improvement using biologically-derived calcium phosphate cement
Sivakumar Gowthaman, Yuta Kumamoto, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Biogeotechnics, 3, 4, 100135, Aug. 2024, [Peer-reviewed], [Last author]
English, Scientific journal, 36907423

Exploration of airborne bacteria for high-efficiency microbial induced carbonate precipitation　　　　　　　　　　　　　　　
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Abstract Book of the 2nd International Conference on Microbial Biotechnology in Construction Materials and Geotechnical Engineering (MBCMG2024), Aug. 2024, [Peer-reviewed], [Last author]
English, International conference proceedings

Evaluating the performance and durability of concrete paving blocks enhanced by bio-cement posttreatment　　　　　　　　　　　　　　　
Navaratnam Rathivarman, Sivakumar Yutharshan, Alakenthiran Kabishangar, Vignarajah Janani, Sivakumar Gowthaman, Thiloththama Hiranya Kumari Nawarathna, Meiqi Chen, Satoru Kawasaki
Abstract Book of the 2nd International Conference on Microbial Biotechnology in Construction Materials and Geotechnical Engineering (MBCMG2024), Aug. 2024, [Peer-reviewed], [Last author]
English, International conference proceedings

Effect of humic acid on soil solidification by enzyme induced carbonate precipitation　　　　　　　　　　　　　　　
Meiqi Chen, Aoi Ichinohe, Kazunori Nakashima, Chikara Takano, Sivakumar Gowthaman, Lutfian R. Daryono, Satoru Kawasaki
Biogeotechnics, 3, 4, 100133, Aug. 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Ecofriendly solidification of sand using microbially induced calcium phosphate precipitation　　　　　　　　　　　　　　　
Maksym Avramenko, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Scientific Reports, 14, 12412, May 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Feasibility study of enhancing enzyme-induced carbonate precipitation with eggshell waste for sand solidification　　　　　　　　　　　　　　　
Zhen Yan, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Biogeotechnics, 2, 4, 100108, May 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Evaluating the performance and durability of concrete paving blocks enhanced by bio-cement posttreatment　　　　　　　　　　　　　　　
Navaratnam Rathivarman, Sivakumar Yutharshan, Alakenthiran Kabishangar, Vignarajah Janani, Sivakumar Gowthaman, Thiloththama Hiranya Kumari Nawarathna, Meiqi Chen, Satoru Kawasaki
Biogeotechnics, 3, 1, 100103, May 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Biosynthesis of a functional silica-based biohybrid material with high Pb(II) capture ability　　　　　　　　　　　　　　　
Ilham Maulidin, Kazunori Nakashima, Ryo Naota, Anju Pilakka Veedu, Chikara Takano, Satoru Kawasaki
ACS Sustainable Resource Management, 1, 5, 916, 929, May 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Soil erosion control of Urmia Lake using indigenous ureolytic calcifying bacteria　　　　　　　　　　　　　　　
A. Mohsenzadeh, T. Ebadi, S. M. Fattahi, A. A. Soorki, M. Bolfion, S. Kawasaki
International Journal of Environmental Science and Technology, 21, 5981, 5996, Feb. 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Biomineralization grouting for beach sand cemented with MICP　　　　　　　　　　　　　　　
Lutfian Rusdi Daryono, Sonoko Aoki, Masanao Kano, Mimori Miyanaga, Kazunori Nakashima, Satoru Kawasaki
Journal of the Civil Engineering Forum, 10, 1, 31, 38, Jan. 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Combination of cellulose nanofiber and artificial fusion protein for biocementation　　　　　　　　　　　　　　　
Thiloththama Hiranya Kumari Nawarathna, Jin Sakai, Kazunori Nakashima, Tetsuya Kawabe, Miki Shikama, Chikara Takano, Satoru Kawasaki
Frontiers in Built Environment, 9:1305003, Jan. 2024, [Peer-reviewed], [Last author]
English, Scientific journal

Bio-cementation of demolition wastes and recycled aggregates for sustainable production of paving blocks　　　　　　　　　　　　　　　
H. N. Muhanna, R. K. M. Niras, U. N. C. Prasadini, S. Gowthaman, T. H. K. Nawarathna, M. Chen, S. Kawasaki
Abstract Book of the 14th International Conference on Sustainable Built Environment – (ICSBE) 2023, 36, Dec. 2023, [Peer-reviewed], [Last author]
English, International conference proceedings

Baseline investigation on enzyme induced calcium phosphate precipitation for solidification of sand
Sivakumar Gowthaman, Moeka Yamamoto, Meiqi Chen, Kazunori Nakashima, Satoru Kawasaki
Frontiers in Built Environment, 9:1307650, Dec. 2023, [Peer-reviewed], [Last author]
English, Scientific journal, 36907423

State-of-the-art review of soil erosion control by MICP and EICP techniques: Problems, applications, and prospects　　　　　　　　　　　　　　　
Yong Wang, Xiaohao Sun, Linchang Miao, Hengxing Wang, Linyu Wu, Wenbo Shi, Satoru Kawasaki
Science of the Total Environment, 912, 169016, Dec. 2023, [Peer-reviewed], [Last author]
English, Scientific journal

The physical and mechanical properties of recycled aggregates strengthened by enzyme induced carbonate precipitation
Yuru Chen, Angran Tian, Xinyu Luo, Yu Zhou, Qiang Tang, Satoru Kawasaki
Soils and Foundations, 63, 6, 101394, Nov. 2023, [Peer-reviewed], [Last author]
English, Scientific journal

Shallow Coastal Carbonate Sediment Mapping for Biomimetics MICP, Case Study of Indonesia Beachrock, Yogyakarta　　　　　　　　　　　　　　　
Lutfian R. Daryono, Kazunori Nakashima, Satoru Kawasaki
Extended Abstracts of International Conference on Case Histories in Geotechnical Engineering and 4th AsRTC6 Urban GeoEngineering Symposium (GEOCASE 2023), G1-1, G1-4, Sep. 2023, [Peer-reviewed], [Last author]
English, International conference proceedings

Eco-friendly soil stabilization method using fish bone as cement material
Maksym Avramenko, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Science of the Total Environment, 900, 165823, Jul. 2023, [Peer-reviewed], [Last author]
English, Scientific journal, 36907423

Characterizing microbial and CO2-induced carbonate minerals: Implications for soil stabilization in sandy environments　　　　　　　　　　　　　　　
Hamed Abdeh Keykha, Alireza Zangani, Hadi Mohamadzadeh Romiani, Afshin Asadi, Satoru Kawasaki, Niloofar Radmanesh
Minerals, 13, 7, 976, Jul. 2023, [Peer-reviewed]
English, Scientific journal

Isolation of acid tolerant bacteria capable of metal adsorption from acid mine drainage without neutralization　　　　　　　　　　　　　　　
S. Iwama, C. Takano, K. Nakashima, H. Aoyagi, S. Kawasaki
Proceedings of the 6th IWA International Conference on eco-Technologies for Wastewater Treatment: ecoSTP2023, Jun. 2023, [Peer-reviewed]
English, International conference proceedings

Metal biosorption from wastewater under acidic environment　　　　　　　　　　　　　　　
C. Takano, K. Nakashima, S. Kawasaki, H. Aoyagi
Proceedings of the 6th IWA International Conference on eco-Technologies for Wastewater Treatment: ecoSTP2023, Jun. 2023, [Peer-reviewed]
English, International conference proceedings

Effects of humic acid on process of microbial induced carbonate precipitation　　　　　　　　　　　　　　　
M. Chen, S. Gowthaman, K. Nakashima, C. Takano, S. Kawasaki
Proceedings of the 9th International Congress on Environmental Geotechnics, 5, 31, 38, Jun. 2023, [Peer-reviewed], [Last author]
English, International conference proceedings

Baseline investigation on soil solidification through biocementation using airborne bacteria　　　　　　　　　　　　　　　
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Frontiers in Bioengineering and Biotechnology, 11:1216171, Jun. 2023, [Peer-reviewed], [Last author]
English, Scientific journal

Functional modification of mussel adhesive protein to control solubility and adhesion property　　　　　　　　　　　　　　　
Anju Pilakka Veedu, Kazunori Nakashima, Hayahide Shiga, Takahiro Sato, Kasun Godigamuwa, Naoki Hiroyoshi, Satoru Kawasaki
Journal of Bioscience and Bioengineering, 1, 7, May 2023, [Peer-reviewed], [Last author]
English, Scientific journal

Field experimentation of bio-cementation using low-cost cementation media for preservation of slope surface
Sivakumar Gowthaman, Hiromu Koizumi, Kazunori Nakashima, Satoru Kawasaki
Case Studies in Construction Materials, 18, e02086, Apr. 2023, [Peer-reviewed], [Last author]
English, Scientific journal

Interfacial biosilica coating of chitosan gel using fusion silicatein to fabricate robust hybrid material for biomolecular applications　　　　　　　　　　　　　　　
Kasun Godigamuwa, Kazunori Nakashima, Sota Tsujitani, Ryo Naota, Ilham Maulidin, Satoru Kawasaki
Journal of Materials Chemistry B, 11, 1654, 1658, Feb. 2023, [Peer-reviewed], [Last author]
English, Scientific journal

Soil improvement using calcium phosphate compounds as a novel sustainable method: A review
Maksym Avramenko, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
International Journal of GEOMATE, 24, 101, 68, 75, Jan. 2023, [Peer-reviewed], [Last author]
English, Scientific journal, 36907423

Naturally derived cements learned from the wisdom of ancestors: A literature review based on the experiences of ancient China, India and Rome
Zhan Su, Zhen Yan, Kazunori Nakashima, Chikara Takano, Satoru Kawasaki
Materials, 16, 2, 603, Jan. 2023, [Peer-reviewed], [Last author]
English, Scientific journal

Densification of sandy soil using geopolymer-modified microbial induced carbonate precipitation　　　　　　　　　　　　　　　
H. M. R. A. Bandara, B. W. C. E. Bandara, T. H. K. Nawarathna, S. Gowthaman, K. Nakashima, S. Kawasaki
Proceedings of the 13th International Conference on Sustainable Built Environment - 2022 (ICSBE 2022), Dec. 2022, [Peer-reviewed], [Last author]
English, International conference proceedings

Metal biosorption process under strongly acidic condition　　　　　　　　　　　　　　　
Chikara Takano, Kazunori Nakashima, Satoru Kawasaki, Hideki Aoyagi
Proceedings of the 27th Symposium of Young Asian Biological Engineers’ Community (YABEC2022), Dec. 2022, [Peer-reviewed]
English, International conference proceedings

Prospects and merits of using calcium phosphate compounds for soil improvement: A review　　　　　　　　　　　　　　　
Maksym Avramenko, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the Twelveth International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2022), 90, 95, Nov. 2022, [Peer-reviewed], [Last author]
English, International conference proceedings

Naturally derived cements for construction and building materials learned from the wisdom of ancestors: A literature review　　　　　　　　　　　　　　　
Su Zhan, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the Twelveth International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2022), 114, 118, Nov. 2022, [Peer-reviewed], [Last author]
English, International conference proceedings

Biomineralization Grouting for Beach Sand Cemented with MICP　　　　　　　　　　　　　　　
Lutfian Rusdi Daryono, Sonoko Aoki, Masanao Kano, Mimori Miyanaga, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the 2022 Annual National Conference 26th PIT HATTI (The 26th Indonesian Society for Geotechnical Engineering (ISGE) Annual Conference), Nov. 2022, [Peer-reviewed], [Last author]
English, International conference proceedings

Feasibility of bacterial-enzyme induced carbonate precipitation technology for stabilizing fine-grained slope soils
Sivakumar Gowthaman, Takashi Iki, Aoi Ichinohe, Kazunori Nakashima, Satoru Kawasaki
Frontiers in Built Environment, 8:1044598, 1, 15, Frontiers Media SA, 12 Oct. 2022, [Peer-reviewed], [Last author]
English, Scientific journal, Microbial Induced Carbonate Precipitation (MICP) has recently become a new technology for stabilizing the slope surface. The applicability of MICP, however, is limited in fine-grained soils due to the restrictions regarding the transportation of bacteria cells. The purpose of this study was to assess the feasibility of an alternative called Bacterial-Enzyme Induced Carbonate Precipitation (B-EICP) for stabilizing the fine-grained slope soils. Unlike the MICP strategy (involving whole-cells of bacteria), the proposed B-EICP utilizes bacterial urease to induce the bio-cement formation within soil. The whole-cell culture of Lysinibacillus xylanilyticus was subjected to cyclic sonication to extract the free urease suspension. The B-EICP treatment was performed to the columns prepared using two different soils obtained from representative expressway slopes. The cementation responses of the proposed B-EICP were compared with that of typical MICP method, especially from the following viewpoints, (i) adaptability to soil with high fine-grained content, (ii) conditions under which B-EICP can be effectively applied and (iii) cementation under low temperature. The results revealed that the extract solution had higher urease activity compared to original bacteria culture, and the activity remained more stable at low temperature conditions (15°C). The results further confirmed that B-EICP method is more suitable for stabilizing soils with large amount of fine particles. Comparing with MICP, the B-EICP resulted higher unconfined compressive strength (over 1200 kPa) and deeper cementation in the silty sand. Microscale analysis suggested that the B-EICP could induce smaller calcium carbonate crystals than that by MICP, but the number of crystals in B-EICP were significantly more, thus contributed to increased particle-particle cementation., 13227211

State-of-the-art review on engineering uses of calcium phosphate compounds: An eco-friendly approach for soil improvement
Maksym Avramenko, Kazunori Nakashima, Satoru Kawasaki
Materials, 15, 19, 6878, 6878, MDPI AG, 03 Oct. 2022, [Peer-reviewed], [Last author]
English, Scientific journal, Greenhouse gas emissions are a critical problem nowadays. The cement manufacturing sector alone accounts for 8% of all human-generated emissions, and as the world’s population grows and globalization intensifies, this sector will require significantly more resources. In order to fulfill the need of geomaterials for construction and to reduce carbon dioxide emissions into the atmosphere, conventional approaches to soil reinforcement need to be reconsidered. Calcium phosphate compounds (CPCs) are new materials that have only recently found their place in the soil reinforcement field. Its eco-friendly, non-toxic, reaction pathway is highly dependent on the pH of the medium and the concentration of components inside the solution. CPCs has advantages over the two most common environmental methods of soil reinforcement, microbial-induced carbonate precipitation (MICP) and enzyme induced carbonate precipitation (EICP); with CPCs, the ammonium problem can be neutralized and thus allowed to be applied in the field. In this review paper, the advantages and disadvantages of the engineering uses of CPCs for soil improvement have been discussed. Additionally, the process of how CPCs perform has been studied and an analysis of existing studies related to soil reinforcement by CPC implementation was conducted., 36907423

Metal biosorption process under low pH conditions for E-waste recycling and polluted water treatment　　　　　　　　　　　　　　　
Chikara Takano, Kazunori Nakashima, Satoru Kawasaki, Hideki Aoyagi
Proceedings of the 15th Asian Congress on Biotechnology, Oct. 2022, [Peer-reviewed]
English, International conference proceedings

Influence of humic acid on microbial induced carbonate precipitation for organic soil improvement
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Environmental Science and Pollution Research, 1, 11, Springer Science and Business Media LLC, Sep. 2022, [Peer-reviewed], [Last author]
English, Scientific journal

Control of adhesion property of mussel foot protein by fusing soluble protein　　　　　　　　　　　　　　　
Anju Pilakka Veedu, Kazunori Nakashima, Takahiro Sato, Satoru Kawasaki
The 19th Asian Pacific Confederation of Chemical Engineering (APCChE) Congress, Aug. 2022, [Peer-reviewed]
English, International conference proceedings

Metal biosorption process under strongly acidic conditions: A part of sustainable metal recycling system　　　　　　　　　　　　　　　
Chikara Takano, Koichi Murayama, Kazunori Nakashima, Satoru Kawasaki, Hideki Aoyagi
International Union of Microbiological Societies, Jul. 2022, [Peer-reviewed]
English, International conference proceedings

Polymer‑assisted enzyme induced carbonate precipitation for non‑ammonia emission soil stabilization
Zhen Yan, Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Scientific Reports, 12, 1, 8821, Springer Science and Business Media LLC, 25 May 2022, [Peer-reviewed], [Last author]
English, Scientific journal, Abstract

Biocementation using enzyme induced carbonate precipitation (EICP) process has become an innovative method for soil improvement. One of the major limitations in scaling-up of biocement treatment is the emission of gaseous ammonia during the urea hydrolysis, which is environmentally hazardous. In order to eliminate this shortcoming, this paper presents a series of experiments performed to evaluate a novel approach for preventing the ammonia byproducts in the EICP process via the use of polyacrylic acid (PAA). Through the adjustment of the pH to acidic, PAA not only promotes the enzyme activity, but also averts the conversion of ammonium to gaseous ammonia and its release, thus preventing any harm to the environment. The sand samples were treated with cementation solution and assessed for improvement in strength. Calcium carbonate content measurements and X-ray powder diffraction analysis identified the calcite crystals precipitated in the soil pores. Scanning electron microscopy analysis clearly showed that calcium carbonate was precipitated connecting soil particles, thus providing a uniaxial compressive strength (UCS) of up to 1.65 MPa. Overall, the inhibition in the speciation of gaseous ammonia shows the great potential of PAA for large-scale promotion of biocement., 36907423

Functional modification of mussel adhesive protein for the control of adhesion and aggregation property　　　　　　　　　　　　　　　
Anju Pilakka Veedu, Kazunori Nakashima, Takahiro Sato, Satoru Kawasaki
European Federation of Biotechnology (EFB) Spring 2022, May 2022, [Peer-reviewed]
English, International conference proceedings

Effects of reaction conditions on EICP-treated desert aeolian sand　　　　　　　　　　　　　　　
Linyu Wu, Linchang Miao, Satoru Kawasaki, Hengxing Wang
KSCE Journal of Civil Engineering, 24 Mar. 2022, [Peer-reviewed]
English, Scientific journal

Durability improvement of biocemented sand by fiber-reinforced MICP for coastal erosion protection
Md Al Imran, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
Materials, 15, 7, 2389, 2389, MDPI AG, 24 Mar. 2022, [Peer-reviewed], [Last author]
English, Scientific journal, Soil improvement via MICP (microbially induced carbonate precipitation) technologies has recently received widespread attention in the geoenvironmental and geotechnical fields. The durability of MICP-treated samples remains a critical concern in this novel method. In this work, fiber (jute)-reinforced MICP-treated samples were investigated to evaluate their durability under exposure to distilled water (DW) and artificial seawater (ASW), so as to advance the understanding of long-term performance mimicking real field conditions, along with improvement of the MICP-treated samples for use in coastal erosion protection. Primarily, the results showed that the addition of fiber (jute) improved the durability of the MICP-treated samples by more than 50%. Results also showed that the wet–dry (WD) cyclic process resulted in adverse effects on the mechanical and physical characteristics of fiber-reinforced MICP-treated samples in both DW and ASW. The breakdown of calcium carbonates and bonding effects in between the sand particles was discovered to be involved in the deterioration of MICP samples caused by WD cycles, and this occurs in two stages. The findings of this study would be extremely beneficial to extend the insight and understanding of improvement and durability responses for significant and effective MICP treatments and/or re-treatments.

Solubilization and aggregation control of silica-polymerizing enzyme fused with a removable soluble protein
Hidetoshi Oguri, Kazunori Nakashima, Kasun Godigamuwa, Junnosuke Okamoto, Yudai Takeda, Fumiyoshi Okazaki, Masafumi Sakono, Satoru Kawasaki
Journal of Bioscience and Bioengineering, 133, 3, 222, 228, Elsevier BV, Mar. 2022, [Peer-reviewed]
English, Scientific journal

Developing a new soil improvement technology using calcium phosphate bio-cement derived from bone waste　　　　　　　　　　　　　　　
M. M, S. Ahamed, M. Y. M. Husny, Sivakumar Gowthaman, Satoru Kawasaki
The 3rd Edition of Advancements in Geotechnical Engineering from Research to Practice (AGERP): International Workshop on Biogeotechnics, Feb. 2022, [Peer-reviewed]
English, International conference proceedings

Coir fiber reinforced EICP-based bio-cementation for the production of low-cost sand bricks　　　　　　　　　　　　　　　
R. Dinoth, P. Purushalini, S. Gowthaman, Satoru Kawasaki
The 3rd Edition of Advancements in Geotechnical Engineering from Research to Practice (AGERP): International Workshop on Biogeotechnics, Feb. 2022, [Peer-reviewed]
English, International conference proceedings

Bio-cementation of demolition waste and recycled aggregates for sustainable pavement construction　　　　　　　　　　　　　　　
W. M. Nabris, J. P. Roshan, S. Gowthaman, Satoru Kawasaki
The 3rd Edition of Advancements in Geotechnical Engineering from Research to Practice (AGERP): International Workshop on Biogeotechnics, Feb. 2022, [Peer-reviewed]
English, International conference proceedings

Removal of ammonium by-products from the effluent of bio-cementation system through struvite precipitation
Sivakumar Gowthaman, Arash Mohsenzadeh, Kazunori Nakashima, Satoru Kawasaki
Materials Today: Proceedings, 61, 2, 243, 249, Elsevier BV, Feb. 2022, [Peer-reviewed]
English, Scientific journal

Bio‐mediated soil improvement: An introspection into processes, materials, characterization and applications
Ning‐Jun Jiang, Yi‐Jie Wang, Jian Chu, Satoru Kawasaki, Chao‐Sheng Tang, Liang Cheng, Yan‐Jun Du, Bettadapura S. Shashank, Devendra N. Singh, Xiao‐Le Han, Yu‐Ze Wang
Soil Use and Management, 38, 1, 68, 93, Wiley, 28 Jan. 2022, [Peer-reviewed]
English, Scientific journal

Beachrock formation mechanism using multiproxy experimental data from natural and artificial beachrocks: Insights for a potential soft engineering method　　　　　　　　　　　　　　　
Giannis Saitis, Anna Karkani, Eleni Koutsopoulou, Konstantinos Tsanakas, Satoru Kawasaki, Niki Evelpidou
Journal of Marine Science and Engineering, 10, 1, 87, 10 Jan. 2022, [Peer-reviewed]
English, Scientific journal

Geochemical characterization of the coastal alluvial aquifer in Wates, Yogyakarta, Indonesia　　　　　　　　　　　　　　　
Phyu Phyu Thin, Heru Hendrayana, Wahyu Wilopo, Satoru Kawasaki
Proceedings of the 13th AUN/SEED-Net Regional Conference on Geological and Geo-Resource Engineering (RC GeoE 2021), Dec. 2021, [Peer-reviewed]
English, International conference proceedings

Influence of cementation level on the mechanical behavior of bio-cemented slope soil treated by surface injection　　　　　　　　　　　　　　　
S. Gowthaman, M. Chen, H. Nakamura, K. Nakashima, S. Kawasaki
Proceedings of the Third International Conference on Geotechnical Engineering ICGE-Colombo-2020, 401, 406, Dec. 2021, [Peer-reviewed]
English, International conference proceedings

Polymer modified microbial induced carbonate precipitation: Novel approach to densify the loose sand　　　　　　　　　　　　　　　
T. H. K. Nawarathna, K. Nakashima, S. Kawasaki
Proceedings of the Third International Conference on Geotechnical Engineering ICGE-Colombo-2020, 332, 336, Dec. 2021, [Peer-reviewed]
English, International conference proceedings

A soil improvement method based on plant-derived urease-induced carbonate precipitation　　　　　　　　　　　　　　　
R. A. N. Dilrukshi, K. Nakashima, S. Kawasaki
Proceedings of the Third International Conference on Geotechnical Engineering ICGE-Colombo-2020, 361, 366, Dec. 2021, [Peer-reviewed]
English, International conference proceedings

Aggregation of magnetite particles by mussel adhesive protein triggered by protease　　　　　　　　　　　　　　　
Anju Pilakka Veedu, Kazunori Nakashima, Hiroki Miyagawa, Satoru Kawasaki
The 26th Symposium of Young Asian Biological Engineers’ Community (YABEC2021), Nov. 2021, [Peer-reviewed]
English, International conference proceedings

Plant enzyme induced carbonate precipitation for sand cementation　　　　　　　　　　　　　　　
Linyu Wu, Linchang Miao, Satoru Kawasaki
Proceedings of the Eleventh International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2021), 63, 68, Nov. 2021, [Peer-reviewed]
English, International conference proceedings

High water content peat soil improved by MICP technique with fiber reinforcement　　　　　　　　　　　　　　　
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Shin Komatsu, Satoru Kawasaki
Proceedings of the Eleventh International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2021), 16, 21, Nov. 2021, [Peer-reviewed]
English, International conference proceedings

Evaluating the effects of polymers on microbially induced carbonate precipitation　　　　　　　　　　　　　　　
Zhen Yan, Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the Eleventh International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2021), 10, 15, Nov. 2021, [Peer-reviewed]
English, International conference proceedings

Used Paper Fibers for Sustainably Enhancing the MICP Stabilization of Sand　　　　　　　　　　　　　　　
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Shin Komatsu, Satoru Kawasaki
Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutions (GeoChina 2021), 52, 64, 19 Sep. 2021, [Peer-reviewed]
English, International conference proceedings

Experimental study on sand stabilization using bio-cementation with wastepaper fiber integration
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Shin Komatsu, Satoru Kawasaki
Materials, 14, 18, 5164, 08 Sep. 2021, [Peer-reviewed]
English, Scientific journal

Calcium phosphate biocement using bone meal and acid urease: An eco-friendly approach for soil improvement　　　　　　　　　　　　　　　
Sivakumar Gowthaman, Moeka Yamamoto, Kazunori Nakashima, Volodymyr Ivanov, Satoru Kawasaki
Journal of Cleaner Production, 319, 128782, 22 Aug. 2021, [Peer-reviewed]
English, Scientific journal

Artificial fusion protein to facilitate calcium carbonate mineralization on insoluble polysaccharide for efficient biocementation
Thiloththama H. K. Nawarathna, Kazunori Nakashima, Tetsuya Kawabe, Wilson Mwandira, Kiyofumi Kurumisawa, Satoru Kawasaki
ACS Sustainable Chemistry & Engineering, 9, 34, 11493, 11502, 12 Aug. 2021, [Peer-reviewed]
English, Scientific journal

CO2-induced carbonate minerals as soil stabilizing agents for dust suppression　　　　　　　　　　　　　　　
Hamed A. Keykha, Hadi Mohamadzadeh Romiani, Ehsan Zebardast, Afshin Asadi, Satoru Kawasaki
Aeolian Research, 52, 100731, 03 Aug. 2021, [Peer-reviewed]
English, Scientific journal

Effect of scallop powder addition on MICP treatment of amorphous peat
Sivakumar Gowthaman, Meiqi Chen, Kazunori Nakashima, Satoru Kawasaki
Frontiers in Environmental Science, 9: 690376, 1, 13, 12 Jul. 2021, [Peer-reviewed]
English, Scientific journal

Durability analysis of bio‑cemented slope soil under the exposure of acid rain
Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Journal of Soils and Sediments, 21, 2831, 2844, 11 Jun. 2021, [Peer-reviewed]
English, Scientific journal, 13227211

Distribution and cementation characteristics of beachrocks along southern, southwestern and western coast of Sri Lanka
Pahala Ge Nishadi Nayanthara, Anjula Buddhika Nayomi Dassanayake, Kazunori Nakashima, Satoru Kawasaki
Journal of Sedimentary Environments, 6, 93, 106, Jun. 2021, [Peer-reviewed]
English, Scientific journal

Fabrication of silica on chitin in ambient conditions using silicatein fused with a chitin-binding domain　　　　　　　　　　　　　　　
Kasun Godigamuwa, Kazunori Nakashima, Sota Tsujitani, Satoru Kawasaki
Bioprocess and Biosystems Engineering, 44, 9, 1883, 1890, 11 May 2021, [Peer-reviewed]
English, Scientific journal

Bio-mediated soil improvement using plant derived enzyme in addition to magnesium ion
Md Al Imran, Kazunori Nakashima, Satoru Kawasaki
Crystals, 11, 5, 516, 06 May 2021, [Peer-reviewed]
English, Scientific journal, 13227211

Fabrication of chitosan gel-silica hybrid materials using fusion silicatein　　　　　　　　　　　　　　　
Kasun Godigamuwa, Kazunori Nakashima, Satoru Kawasaki
Virtual conference organized by the European Federation of Biotechnology (EFB2021), May 2021, [Peer-reviewed]
English, International conference proceedings

Insights in beachrock formation mechanism using multiproxy experimental data: Case study of Diolkos, Corinth, Greece　　　　　　　　　　　　　　　
Giannis Saitis, Konstantinos Tsanakas, Anna Karkani, Satoru Kawasaki, Niki Evelpidou
European Geosciences Union General Assembly 2021, vEGU21, 27 Apr. 2021, [Peer-reviewed]
English, International conference proceedings

Effect of wetting and drying cycles on the durability of bio‑cemented soil of expressway slope
S. Gowthaman, K. Nakashima, S. Kawasaki
International Journal of Environmental Science and Technology, Online first article, 1, 14, 15 Apr. 2021, [Peer-reviewed]
English, Scientific journal, 13227211

Experimental study on strengthening near-surface of slopes using bio-grouting technique　　　　　　　　　　　　　　　
Sivakumar Gowthaman, Kazunori Nakashima, Hiromi Nakamura, Satoru Kawasaki
Proceedings of the 1st International Symposium on Construction Resources for Environmentally Sustainable Technologies (CREST 2020), 10 Mar. 2021, [Peer-reviewed]
English, International conference proceedings

Green soil improvement: using carbon dioxide to enhance the behaviour of clay
Hadi Mohamadzadeh Romiani, Hamed Abdeh Keykha, Milad Talebi, Afshin Asadi, Satoru Kawasaki
Proceedings of the Institution of Civil Engineers - Ground Improvement, Ahead of Print, 1, 26, Thomas Telford Ltd., 22 Feb. 2021, [Peer-reviewed]
English, Scientific journal

Improvement of using crude extract urease from watermelon seeds for biocementation technology
Md Al Imran, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
International Journal of GEOMATE, 20, 78, 148, 153, Feb. 2021, [Peer-reviewed]
English, Scientific journal

Evaluating mechanical strength of peat soil treated by fiber incorporated bio-cementation
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
International Journal of GEOMATE, 20, 78, 121, 127, Feb. 2021, [Peer-reviewed]
English, Scientific journal

A two-stage treatment process for the management of produced ammonium by-products in ureolytic bio-cementation process
A. Mohsenzadeh, E. Aflaki, S. Gowthaman, K. Nakashima, S. Kawasaki, T. Ebadi
International Journal of Environmental Science and Technology, Online first article, Springer Science and Business Media LLC, 27 Jan. 2021, [Peer-reviewed]
English, Scientific journal

Shoreline mapping based on beachrocks identification in Krakal-Sadranan beach, Yogyakarta, Indonesia
Lutfian R. Daryono, Kazunori Nakashima, Satoru Kawasaki, Anastasia D. Titisari, Didit H. Barianto, Imam Suyanto, Arief Rahmadi
Bulletin of Engineering Geology and the Environment, 80, 3, 2825, 2844, 10 Jan. 2021, [Peer-reviewed]
English, Scientific journal

Biosorption of Pb (II) and Zn (II) from aqueous solution by Oceanobacillus profundus isolated from an abandoned mine
Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki, Allison Arabelo, Kawawa Banda, Imasiku Nyambe, Meki Chirwa, Mayumi Ito, Tsutomu Sato, Toshifumi Igarashi, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka
Scientific Reports, 10, 1, 21189, 21189, Springer Science and Business Media LLC, Dec. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal, AbstractThe present study investigated biosorption of Pb (II) and Zn (II) using a heavy metal tolerant bacterium Oceanobacillus profundus KBZ 3-2 isolated from a contaminated site. The effects of process parameters such as effect on bacterial growth, pH and initial lead ion concentration were studied. The results showed that the maximum removal percentage for Pb (II) was 97% at an initial concentration of 50 mg/L whereas maximum removal percentage for Zn (II) was at 54% at an initial concentration of 2 mg/L obtained at pH 6 and 30 °C. The isolated bacteria were found to sequester both Pb (II) and Zn (II) in the extracellular polymeric substance (EPS). The EPS facilitates ion exchange and metal chelation-complexation by virtue of the existence of ionizable functional groups such as carboxyl, sulfate, and phosphate present in the protein and polysaccharides. Therefore, the use of indigenous bacteria in the remediation of contaminated water is an eco-friendly way of solving anthropogenic contamination.

Development of artificial beachrock using watermelon seeds as a source of urease　　　　　　　　　　　　　　　
Md. Al Imran, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
Proceedings of the Tenth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2020), 356, 361, Nov. 2020, [Peer-reviewed]
English, International conference proceedings

Evaluation on the performance of MICP treated slope soil under acid rain environment　　　　　　　　　　　　　　　
Sivakumar Gowthaman, Arash Mohsenzadeh, Kazunori Nakashima, Hiromi Nakamura, Satoru Kawasaki
Proceedings of the Tenth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2020), 82, 87, Nov. 2020, [Peer-reviewed]
English, International conference proceedings

Mechanical strength of peat soil treated by fiber incorporated microbial cementation　　　　　　　　　　　　　　　
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the Tenth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2020), 41, 46, Nov. 2020, [Peer-reviewed]
English, International conference proceedings

Enzyme Induced Biocementation Using Watermelon Seed as a Source of Urease　　　　　　　　　　　　　　　
Md Al Imran, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the First International Conference (Online) on Microbial Biotechnology in Construction Materials and Geotechnical Engineering (MBCMG2020), Nov. 2020, [Peer-reviewed]
English, International conference proceedings

Mechanical Strength of Organic Soil Treated by Fiber Incorporated Microbial Cementation　　　　　　　　　　　　　　　
Sivakumar Gowthaman, Pahala Ge Nishadi Nayanthara, Kazunori Nakashima, Satoru Kawasaki, Atsuko Sato
Proceedings of the First International Conference (Online) on Microbial Biotechnology in Construction Materials and Geotechnical Engineering (MBCMG2020), Nov. 2020, [Peer-reviewed]
English, International conference proceedings

Control of aquifer weathering degree to the groundwater chemical composition in Wates Coastal Aquifer, Yogyakarta, Indonesia
Heru Hendrayana, Phyu Phyu Thin, Wahyu Wilopo, Satoru Kawasaki
E3S Web of Conferences, The 1st Geosciences and Environmental Sciences Symposium (ICST 2020), 200, 02005, 02005, EDP Sciences, 23 Oct. 2020, [Peer-reviewed]
English, International conference proceedings, The studied coastal aquifer has been encountered a complex hydrochemical evolution. Interesting aspect is the occurrence of groundwater facies with different water chemistries in close proximity to each other. Water salinity is reported from local parts away from shore. This research was conducted for assessment of aquifer weathering and its control on groundwater chemistry. An investigation of major ions in 27 water samples was performed with geostatistics, graphical method, mineral saturation index and mass balance transport to identify the groundwater evolution. Geochemical analysis of sediments was made of 8 samples, to estimate the weathering degree using chemical index of alteration and chemical index of weathering. Silicate dissolution was promoted by low weathering, which was reflected in low ions dominated by calcium and bicarbonate in fresh water. It leaded to fine sands. Silts were dominant under moderate weathering. Sodium and calcium were higher than fresh water. Bicarbonate was still highest concentration. Main water was the mixed type which was indicated by moderate ions. Clays were formed by high weathering. Water salinity with highest dissolved solids was caused by halite dissolution and calcium adsorption on clays. Overall, groundwater chemistry in the study area is locally characterized by prevailing lithology in grouping patterns.

The Influence of the Addition of Plant-Based Natural Fibers (Jute) on Biocemented Sand Using MICP Method　　　　　　　　　　　　　　　
Md Al Imran, Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Materials, 13, 18, 4198, Sep. 2020, [Peer-reviewed], [Last author]
English, Scientific journal

The Utilization of Agricultural Waste as Agro-Cement in Concrete: A Review
Jing He, Satoru Kawasaki, Varenyam Achal
Sustainability, 12, 17, 6971, 6971, MDPI AG, 27 Aug. 2020, [Peer-reviewed]
English, Scientific journal, Concrete, as the world’s most implemented construction material, is increasingly being used because of the rapid development of industrialization and urbanization. Limited resources and progressive depravation of the environment are forcing scientific efforts to seek alternative and effective materials from large amounts of natural resources as additives in the partial replacement of cement. Cement is a main constituent of concrete. To solve and minimize environmental issues, research works attempting to employ the wide availability of agricultural wastes, such as sugar cane bagasse, rice husk, sugar cane straw, and palm oil fuel, among others, into cement, and to finally bring sustainable and environmentally friendly properties to concrete are being examined. Agro-waste materials are crushed into fine and coarse aggregates or are burnt into ash, and are then mixed with cement, which is known as agro-cement. The replacement of aggregates, either partially or fully, is also deemed as a sustainable material in construction. This paper mainly reviews the current research on agro-cement that has been researched and applied for the enhancement of the strength and durability of concrete. It further summarizes the relevant knowledge and techniques, while providing optimal parameters for applying agricultural wastes in concrete.

Freeze-thaw durability and shear responses of cemented slope soil treated by microbial induced carbonate precipitation
Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Soils and Foundations, 60, 4, 840, 855, Elsevier BV, Aug. 2020, [Peer-reviewed]
English, Scientific journal

Biological route to fabricate silica on cellulose using immobilized silicatein fused with a carbohydrate-binding module
Kasun Godigamuwa, Kazunori Nakashima, Junnosuke Okamoto, Satoru Kawasaki
Biomacromolecules, American Chemical Society (ACS), 16 Jun. 2020, [Peer-reviewed], [Last author]
English, Scientific journal

Influence of Wet-Dry and Freeze-Thaw Cycles on the Physical and Mechanical Properties of MICP Treated Slope Soil　　　　　　　　　　　　　　　
S. Gowthaman, K. Nakashima, H. Nakamura, S. Kawasaki
Proceedings of the 54th U.S. Rock Mechanics/Geomechanics Symposium, ARMA-2020-1119, Jun. 2020, [Peer-reviewed], [Last author]
English, International conference proceedings

Innovative Approach for Addressing Coastal Erosion Protection Using Microbial Induced Carbonate Precipitation　　　　　　　　　　　　　　　
Md Al Imran, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
European Geosciences Union General Assembly 2020, May 2020, [Peer-reviewed]
English, International conference proceedings

A Feasibility Investigation for Developing Artificial Beachrocks: A Potential Measure for Coastal Protection in Southeast Yogyakarta Coast, Indonesia　　　　　　　　　　　　　　　
Lutfian Rusdi Daryono, Kazunori Nakashima, Satoru Kawasaki, Koichi Suzuki, Anastasia Dewi Titisari, Didit Hadi Barianto, Imam Suyanto, Arief Rahmadi
European Geosciences Union General Assembly 2020, May 2020, [Peer-reviewed]
English, International conference proceedings

Cellulose-metallothionein biosorbent for removal of Pb(II) and Zn(II) from polluted water　　　　　　　　　　　　　　　
Wilson Mwandira, Kazunori Nakashima, Yuki Togo, Tsutomu Sato, Satoru Kawasaki
Chemosphere, 246, 125733, May 2020, [Peer-reviewed]
English, Scientific journal

Investigation of natural beachrock and physical-mechanical comparison with artificial beachrock induced by MICP as a protective measure against beach erosion at Yogyakarta, Indonesia　　　　　　　　　　　　　　　
Lutfian R. Daryono, Kazunori Nakashima, Satoru Kawasaki, Koichi Suzuki, Imam Suyanto, Arief Rahmadi
Geosciences, 10, 4, 143, Apr. 2020, [Peer-reviewed]
English, Scientific journal

A novel metal adsorbent composed of hexa-histidine tag and carbohydrate-binding module on cellulose　　　　　　　　　　　　　　　
Yuki Togo, Kazunori Nakashima, Wilson Mwandira, Satoru Kawasaki
Analytical Sciences, 36, 4, 459, 464, Apr. 2020, [Peer-reviewed]
English, Scientific journal

Microbial Leaching of Iron from Hematite: Direct or Indirect Elution　　　　　　　　　　　　　　　
Apichaya Aneksampant, Kazunori Nakashima, Satoru Kawasaki
Materials Transactions, 61, 2, 396, 401, Feb. 2020, [Peer-reviewed]
English, Scientific journal

Sediment characteristics of beachrock: A baseline investigation based on microbial induced carbonate precipitation at Krakal-Sadranan Beach, Yogyakarta, Indonesia　　　　　　　　　　　　　　　
Lutfian Rusdi Daryono, Kazunori Nakashima, Satoru Kawasaki, Anastasia Dewi Titisari, Didit Hadi Barianto
Applied Sciences, 10, 2, 520, Jan. 2020, [Peer-reviewed]
English, Scientific journal

Evolution of relative sea level in Okinawa (Japan) during Holocene　　　　　　　　　　　　　　　
Niki Evelpidou, Satoru Kawasaki, Anna Karkani, Giannis Saitis, Giorgio Spada, Georgios Economou
Geografia Fisica e Dinamica Quaternaria, 42, 1, 3, 16, Dec. 2019, [Peer-reviewed]
English, Scientific journal

Laboratory conditions for maximal calcium carbonate precipitation induced by Sporosarcina pasteurii and Sporosarcina aquimarina bacteria　　　　　　　　　　　　　　　
Hamed A. Keykha, Afshin Asadi, Bujang B. K. Huat, Satoru Kawasaki
Environmental Geotechnics, 6, 8, 562, 566, Dec. 2019, [Peer-reviewed]
English, Scientific journal

Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region　　　　　　　　　　　　　　　
Sivakumar Gowthaman, Takashi Iki, Kazunori Nakashima, Koji Ebina, Satoru Kawasaki
SN Applied Sciences, 1, 11, 1480, Nov. 2019, [Peer-reviewed]
English, Scientific journal

Biocementation of Sri Lankan beach sand using locally isolated bacteria: A baseline study on the effect of segregated culture media　　　　　　　　　　　　　　　
Pahala Ge Nishadi Nayanthara, Anjula Buddhika Nayomi Dassanayake, Kazunori Nakashima, Satoru Kawasaki
International Journal of GEOMATE, 17, 63, 55, 62, Nov. 2019, [Peer-reviewed]
English, Scientific journal

Feasibility study of native ureolytic bacteria for biocementation towards coastal erosion protection by MICP method
Md Al Imran, Shuya Kimura, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
Applied Sciences (Switzerland), 9, 20, MDPI AG, 01 Oct. 2019
English, Scientific journal

A novel sustainable approach for coastal erosion protection through biocementation　　　　　　　　　　　　　　　
Md Al Imran, Shuya Kimura, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
Applied Sciences, 9, 20, 4462, Oct. 2019, [Peer-reviewed]
English, Scientific journal

A Comparative Study of Beachrock Mechanism Formation Focusing on Natural and Artificial Beachrocks: Case of Diolkos, Corinth, Greece and Sumuide, Okinawa, Japan　　　　　　　　　　　　　　　
Giannis Saitis, Eleni Koutsopoulou, Niki Evelpidou, Satoru Kawasaki
The International Association of Geomorphologists (IAG) Regional Conference on Geomorphology (RCG2019), P.2.05, Sep. 2019, [Peer-reviewed]
English, International conference proceedings

Engineered Escherichia coli cell capable of specific binding to metal surface　　　　　　　　　　　　　　　
K. Nakashima, Y. Iwata, S. Kawasaki
ACS Fall 2019 National Meeting & Exposition, San Diego, United States, Aug. 2019, [Peer-reviewed]
English, International conference proceedings

Microbially induced carbonate precipitation assisted by poly-L-lysine: ecofriendly approach inspired by nature　　　　　　　　　　　　　　　
T.H.K. Nawarathna, K. Nakashima, S. Kawasaki
ACS Fall 2019 National Meeting & Exposition, San Diego, United States, Aug. 2019, [Peer-reviewed]
English, International conference proceedings

Beachrock identification using geology and geophysical approaches in Indonesia　　　　　　　　　　　　　　　
Daryono L. R, Nakashima K, Kawasaki S, Titisari A. D, Barianto D. H, Suyanto I, Rahmadi A
Proceedings of International Symposium on Earth Resources Management and Environment, ISERME 2019, 51, 59, Aug. 2019, [Peer-reviewed]
English, International conference proceedings

Microbial Induced Carbonate Precipitation Using a Native Inland Bacterium for Beach Sand Stabilization in Nearshore Areas　　　　　　　　　　　　　　　
Pahala Ge Nishadi Nayanthara, Anjula Buddhika Nayomi Dassanayake, Kazunori Nakashima, Satoru Kawasaki
Applied Sciences, 9, 15, 3201, Aug. 2019, [Peer-reviewed]
English, Scientific journal

Solidification of sand by Pb(II)-tolerant bacteria for capping mine waste to control metallic dust: Case of the abandoned Kabwe Mine, Zambia.
Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki, Mayumi Ito, Tsutomu Sato, Toshifumi Igarashi, Meki Chirwa, Kawawa Banda, Imasiku Nyambe, Shouta Nakayama, Hokuto Nakata, Mayumi Ishizuka
Chemosphere, 228, 17, 25, Aug. 2019, [Peer-reviewed], [International Magazine]
English, Scientific journal, Environmental impacts resulting from historic lead and zinc mining in Kabwe, Zambia affect human health due to the dust generated from the mine waste that contains lead, a known hazardous pollutant. We employed microbially induced calcium carbonate precipitation (MICP), an alternative capping method, to prevent dust generation and reduce the mobility of contaminants. Pb-resistant Oceanobacillus profundus KBZ 1-3 and O. profundus KBZ 2-5 isolated from Kabwe were used to biocement the sand that would act as a cover to prevent dust and water infiltration. Sand biocemented by KBZ 1-3 and KBZ 2-5 had maximum unconfined compressive strength values of 3.2 MPa and 5.5 MPa, respectively. Additionally, biocemented sand exhibited reduced water permeability values of 9.6 × 10-8 m/s and 8.9 × 10-8 m/s for O. profundus KBZ 1-3 and KBZ 2-5, respectively, which could potentially limit the entrance of water and oxygen into the dump, hence reducing the leaching of heavy metals. We propose that these isolates represent an option for bioremediating contaminated waste by preventing both metallic dust from becoming airborne and rainwater from infiltrating into the waste. O. profundus KBZ 1-3 and O. profundus KBZ 2-5 isolated form Kabwe represent a novel species that has, for the first time, been applied in a bioremediation study.

Microbial induced slope surface stabilization using industrial-grade chemicals: A preliminary laboratory study　　　　　　　　　　　　　　　
Sivakumar Gothaman, Shumpei Mitsuyama, Kazunori Nakashima, Masahiro Komatsu, Satoru Kawasaki
International Journal of GEOMATE, 17, 60, 110, 116, Aug. 2019, [Peer-reviewed]
English, Scientific journal

Zinc and Lead Biosorption by Oceanobacillus Profundus Kbz 3-2: a Bacterial Strain Resistant to Metals Isolated from Metal polluted Soils in Kabwe, Zambia　　　　　　　　　　　　　　　
Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki, Mayumi Ito, Tsutomu Sato, Toshifumi Igarashi, Meki Chirwa, Kawawa Banda, Imasiku Nyambe, Shouta Nakayama, Mayumi Ishizuka
Proceedings of the 14th Asian Congress on Biotechnology (ACB2019), Jul. 2019, [Peer-reviewed]
English, International conference proceedings

Biological Control of Filament Formation Composed of Silica-polymerizing Enzymes　　　　　　　　　　　　　　　
Kazunori Nakashima, Junnosuke Okamoto, Satoru Kawasaki
Proceedings of the 14th Asian Congress on Biotechnology (ACB2019), Jul. 2019, [Peer-reviewed]
English, International conference proceedings

Chitosan enhances calcium carbonate precipitation and solidification mediated by bacteria　　　　　　　　　　　　　　　
Thiloththama Hiranya Kumari Nawarathna, Kazunori Nakashima, Satoru Kawasaki
International Journal of Biological Macromolecules, 133, 867, 874, Jul. 2019, [Peer-reviewed]
English, Scientific journal

Bio-cementation for Slope Soil Stabilization againstSurface Erosion: A Bench-scale Preliminary Investigation　　　　　　　　　　　　　　　
S. Gowthaman, K. Nakashima, K. Ebina, S. Kawasaki
Proceedings of the 53rd US Rock Mechanics/Geomechanics Symposium, Jun. 2019, [Peer-reviewed]
English, International conference proceedings

Development of small scale biocemented rocks based on natural beachrock cement characteristics as a novel approach towards coastal erosion mitigation　　　　　　　　　　　　　　　
P. G. N. Nayanthara, A. B. N. Dassanayake, K. Nakashima, S. Kawasaki
Proceedings of the 53rd US Rock Mechanics / Geomechanics Symposium, Jun. 2019, [Peer-reviewed]
English, International conference proceedings

A minerochemical cement study of a beachrock slab: The case study of Peristeria, Salamis Island　　　　　　　　　　　　　　　
Saitis G, Evelpidou N, Kawasaki S, Koutsopoulou E, Komi A
Proceedings of the 15th International Congress of the Goelogical Society of Greece, May 2019, [Peer-reviewed]
English, International conference proceedings

Ecofriendly calcium phosphate and calcium bicarbonate biogrouts　　　　　　　　　　　　　　　
Volodymyr Ivanov, Viktor Stabnikov, Satoru Kawasaki
Journal of Cleaner Production, 218, 328, 334, May 2019, [Peer-reviewed]
English, Scientific journal

Efficacy of biocementation of lead mine waste from the Kabwe Mine site evaluated using Pararhodobacter sp.　　　　　　　　　　　　　　　
Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki, Mayumi Ito, Tsutomu Sato, Toshifumi Igarashi, Kawawa Banda, Meki Chirwa, Imasiku Nyambe, Shouta Nakayama, Mayumi Ishizuka
Environmental Science and Pollution Research, 26, 15653, 15664, Apr. 2019, [Peer-reviewed]
English, Scientific journal

Biogeotechnical approach for slope soil stabilization using locally isolated bacteria and inexpensive low-grade chemicals: A feasibility study on Hokkaido expressway soil, Japan　　　　　　　　　　　　　　　
Sivakumar Gothaman, Shumpei Mitsuyama, Kazunori Nakashima, Masahiro Komatsu, Satoru Kawasaki
Soils and Foundations, 59, 2, 484, 499, Apr. 2019, [Peer-reviewed]
English, Scientific journal

Factors affecting the urease activity of native ureolytic bacteria isolated from coastal areas　　　　　　　　　　　　　　　
Md Al Imran, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
Geomechanisc and Engineering, An International Journal, 17, 5, 421, 427, Apr. 2019, [Peer-reviewed]
English, Scientific journal

Biogeochemical simulation of microbially induced calcite precipitation with Pararhodobacter sp. strain SO1　　　　　　　　　　　　　　　
Masaru Akiyama, Satoru Kawasaki
Acta Geotechnica, 14, 3, 685, 696, Mar. 2019, [Peer-reviewed]
English, Scientific journal

Environmental safety and biosafety in construction biotechnology　　　　　　　　　　　　　　　
Volodymyr Ivanov, Viktor Stabnikov, Olena Stabnikova, Satoru Kawasaki
World Journal of Microbiology and Biotechnology, 35, 26, 1, 11, Feb. 2019, [Peer-reviewed]
English, Scientific journal

Ammonium-free carbonate-producing bacteria as an ecofriendly soil biostabilizer　　　　　　　　　　　　　　　
Keykha, H. A, Mohamadzadeh, H, Asadi, A, Kawasaki, S
Geotechnical Testing Journal, 42, 1, 19, 29, Jan. 2019, [Peer-reviewed]
English, Scientific journal

Geological spatial plan toward groundwater resources in Kertek, Wonosobo Basin, Central Java, Indonesia　　　　　　　　　　　　　　　
L.R. Daryono, M.S.D. Wijayaningsih, A. Hendratno, M. Nukman, E. Hartantyo, S. Kawasaki
Journal of Degraded and Mining Lands Management, 6, 2, 1595, 1608, Jan. 2019, [Peer-reviewed]
English, Scientific journal

Evaluating possible avenues for soil improvement by biocementation in Sri Lanka: A preliminary investigation　　　　　　　　　　　　　　　
P. G. N. Nayanthara, A. B, N. Dassanayake, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the Eighth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2018), 759, 764, Nov. 2018, [Peer-reviewed]
English, International conference proceedings

Bio-inspired stabilization of embankment soil mediating Psychrobacillus sp. and low-grade chemicals: Preliminary laboratory investigation　　　　　　　　　　　　　　　
Sivakumar Gowthaman, Shumpei Mitsuyama, Kazunori Nakashima, Masahiro Komatsu, Satoru Kawasaki
Proceedings of the Eighth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2018), 163, 168, Nov. 2018, [Peer-reviewed]
English, International conference proceedings

Electricity generation from rice bran by a microbial fuel cell and the influence of hydrodynamic cavitation pretreatment
Yuta Yoshimura, Kazunori Nakashima, Masaji Kato, Kengo Inoue, Fumiyoshi Okazaki, Hitoshi Soyama, Satoru Kawasaki
ACS Omega, 3, 11, 15267, 15271, Nov. 2018, [Peer-reviewed]
English, Scientific journal

Bio-based cementation using urease-producing bacteria: Sand solidification and kinetics　　　　　　　　　　　　　　　
K. Nakashima, M. Fujita, T. H. K. Nawarathna, S. Kawasaki
New Biotechnology, 44, s154, Oct. 2018, [Peer-reviewed]
English, International conference proceedings

Comparative characteristics of cement materials in natural and artificial beachrocks using a petrographic method　　　　　　　　　　　　　　　
L. R. Daryono, A. D. Titisari, I. W. Warmada, S. Kawasaki
Bulletin of Engineering Geology and the Environment, Sep. 2018, [Peer-reviewed]
English, Scientific journal

Effects of various factors on carbonate particle growth using ureolytic bacteria　　　　　　　　　　　　　　　
Md. Al Imran, Mai Shinmura, Kazunori Nakashima, Satoru Kawasaki
Materials Transactions, 59, 9, 1520, 1527, Sep. 2018, [Peer-reviewed]
English, Scientific journal

A preliminary investigation on isolation and identification of marine bacteria for biocementation in nearshore environments　　　　　　　　　　　　　　　
Nayanthara P. G. N, Dassanayake A. B. N, Nakashima K, Kawasaki S
Proceedings of International Symposium on Earth Resources Management and Environment, ISERME 2018, 111, 118, Aug. 2018, [Peer-reviewed]
English, International conference proceedings

Experimental optimization of biocement formation: Alternative countermeasure for surface erosion of cut slope　　　　　　　　　　　　　　　
Gowthaman S, Nakashima K, Ebina K, Kawasaki S
Proceedings of International Symposium on Earth Resources Management and Environment, ISERME 2018, 97, 103, Aug. 2018, [Peer-reviewed]
English, International conference proceedings

Soil improvement using plant-derived urease-induced calcium carbonate precipitation　　　　　　　　　　　　　　　
R. A. N. Dilrukshi, Kazunori Nakashima, Satoru Kawasaki
Soils and Foundations, 58, 4, 894, 910, Aug. 2018, [Peer-reviewed]
English, Scientific journal

Applicability of coastal ureolytic bacteria to coastal protection in Greece　　　　　　　　　　　　　　　
Md. Al Imran, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
2018 International Conference on Geomechanics and Engineering (ICGE18), Aug. 2018, [Peer-reviewed]
English, International conference proceedings

Effects of cationic polypeptide on CaCO3 crystallization and sand solidification by microbial-induced carbonate precipitation　　　　　　　　　　　　　　　
Thiloththama H. K. Nawarathna, Kazunori Nakashima, Masahiro Fujita, Momoko Takatsu, Satoru Kawasaki
ACS Sustainable Chemistry and Engineering, 6, 8, 10315, 10322, Jul. 2018, [Peer-reviewed]
English, Scientific journal

Assessment of groundwater facies in Wates coastal area, Kulon Progo, Yogyakarta, Indonesia　　　　　　　　　　　　　　　
Phyu Phyu Thin, Heru Hendrayana, Wahyu Wilopo, Satoru Kawasaki
Journal of Degraded and Mining Lands Management, 5, 4, 1389, 1401, Jul. 2018, [Peer-reviewed]
English, Scientific journal

A state-of-the-art review on soil reinforcement technology using natural plant fiber materials: Past findings, present trends and future directions
Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Materials, 11, 4, 553, MDPI AG, 04 Apr. 2018, [Peer-reviewed]
English, Scientific journal

Fly ash incorporated with biocement to improve strength of expansive soil　　　　　　　　　　　　　　　
Mengmeng Li, Chaolin Fang, Satoru Kawasaki, Varenyam Achal
Scientific Reports, 8:2565, Feb. 2018, [Peer-reviewed]
English, Scientific journal

Bio-consolidation of cracks in masonry cement mortars by Acinetobacter sp. SC4 isolated from a karst cave
Mengmeng Li, Chaolin Fang, Satoru Kawasaki, Minsheng Huang, Varenyam Achal
International Biodeterioration and Biodegradation, 141, 94, 100, Elsevier Ltd, 2018, [Peer-reviewed]
English, Scientific journal

Enhancement of microbially induced carbonate precipitation using organic biopolymer
Thiloththama Hiranya Kumari Nawarathna, Kazunori Nakashima, Satoru Kawasaki
International Journal of GEOMATE, 14, 41, 7, 12, GEOMATE International Society, 2018, [Peer-reviewed]
English, Scientific journal

Factors Affecting Sand Solidiflcation Using MICP with Pararhodobacter sp.
G. G.N.N. Amarakoon, Satoru Kawasaki
Materials Transactions, 59, 1, 72, 81, Japan Institute of Metals (JIM), 2018, [Peer-reviewed]
English, Scientific journal

Bioremediation of lead-contaminated mine waste by Pararhodobacter sp based on the microbially induced calcium carbonate precipitation technique and its effects on strength of coarse and fine grained sand
Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki
ECOLOGICAL ENGINEERING, 109, Part A, 57, 64, Dec. 2017, [Peer-reviewed]
English, Scientific journal

Microbially induced carbonate precipitation for expressway slope protection　　　　　　　　　　　　　　　
Mitsuyama, S, Nakashima, K, Komatsu, M, Kawasaki, S
Abstract Proceedings of the 1st International KAMPAI Symposium on Sustainable Management of Resources and Environment in the 21st Century, 23, Nov. 2017, [Peer-reviewed]
English, International conference proceedings

Effect of cationic bio-polymer on CaCO3 crystallization by microbe　　　　　　　　　　　　　　　
T.H.K. Nawarathna, Kazunori Nakashima, Satoru Kawasaki
Abstract Proceedings of the 1st International KAMPAI Symposium on Sustainable Management of Resources and Environment in the 21st Century, 24, Nov. 2017, [Peer-reviewed]
English, International conference proceedings

Immobilization of Lead-Contaminated Mine Waste by Pararhodobacter sp.　　　　　　　　　　　　　　　
Mwandira, W, Nakashima, K, Kawasaki, S, Chirwa, M, Banda, K.E, Nyambe, I.A
Abstract Proceedings of the 1st International KAMPAI Symposium on Sustainable Management of Resources and Environment in the 21st Century, 39, Nov. 2017, [Peer-reviewed]
English, International conference proceedings

Effect of Organic biopolymer on the microbially induced carbonate precipitation and its morphology　　　　　　　　　　　　　　　
Thiloththama Hiranya Kumari Nawarathna, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the Seventh International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2017), 7, 1, 719, 724, Nov. 2017, [Peer-reviewed]
English, International conference proceedings

Usefulness of artificial beachrock and geotextile tube technology　　　　　　　　　　　　　　　
Md. Al Imran, Kazanori Nakashima, Satoru Kawasaki
Proceedings of the Seventh International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2017, 7, 1, 423, 428, Nov. 2017, [Peer-reviewed]
English, International conference proceedings

Application of numerical simulation of microbial reaction to biogrout with ureolytic bacteria
Masaru Akiyama, Satoru Kawasaki
Japanese Geotechnical Journal, 12, 3, 337, 349, The Japanese Geotechnical Society, Sep. 2017, [Peer-reviewed]
Japanese, Scientific journal, Reproduction of solidification process by biogrout with ureolytic bacteria was conducted using numerical simulation of microbial reaction for contributing to the environmental impact assessment and the proper construction design according to ground conditions in the practical utilization of the biogrout. Based on results of the urease activity measurement, the reaction rate constant and the half saturation concentration in the reproduction analysis was determined to 1×10^-8 mol/mg/sec and 0.635 mol/L, respectively. Mineral precipitation in the simulation matched actual mineral precipitation in the syringe-scale solidification test under the constraint condition of calcite precipitation only. Multiple injection procedure of solidification solution contained urea were expressed by setting sequential analysis, in which the initial condition of the current analysis succeeds the amount of calcite in the previous step. In addition to that, the changes of Ca²⁺ concentration in outlet solution were reproduced by introducing the “adjustment exponent” in consideration of the decrease in the amount of active microorganisms. In that case, the correlation coefficient between the measured and analyzed values was 0.9232. The above results indicate that numerical simulation of microbial reaction related to calcite precipitation can reproduce the reaction process of biogrout with ureolytic bacteria, and can predict the strength development and construction management at the time of biogrout construction.

Efect of organic bio-polymer on bio-mineralization of CaCO3　　　　　　　　　　　　　　　
T.H.K. Hiranya, Kazunori Nakashima, Satoru Kawasaki
Proceedings of International Symposium on Earth Resources Management and Environment, ISERME 2017, 59, 66, Aug. 2017, [Peer-reviewed]
English, International conference proceedings

Bioremediation of lead-contaminated mine waste using microbially induced carbonate precipitation　　　　　　　　　　　　　　　
Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki
Proceedings of International Symposium on Earth Resources Management and Environment, ISERME 2017, 21, 25, Aug. 2017, [Peer-reviewed]
English, International conference proceedings

Whole-cell evaluation of urease activity of Pararhodobacter sp isolated from peripheral beachrock
Masahiro Fujita, Kazunori Nakashima, Varenyam Achal, Satoru Kawasaki
BIOCHEMICAL ENGINEERING JOURNAL, 124, 1, 5, Aug. 2017, [Peer-reviewed]
English, Scientific journal

Solubilization and functional evaluation of silica-polymerizing enzyme　　　　　　　　　　　　　　　
Hidetoshi Oguri, Kazunori Nakashima, Satoru Kawasaki
The 13th the Asian Congress on Biotechnology 2017 (ACB2017), Jul. 2017, [Peer-reviewed]
English, International conference proceedings

Combination technology of geotextile tube and artificial beachrock for coastal protection
Md. Al Imran, Kazunori Nakashima, Satoru Kawasaki
International Journal of GEOMATE, 13, 39, 67, 72, GEOMATE International Society, 2017, [Peer-reviewed]
English, Scientific journal

Evaluation of porosity in biogrouted sand using microfocus X-ray CT
Shumpei Mitsuyama, Kazunori Nakashima, Satoru Kawasaki
International Journal of GEOMATE, 12, 31, 71, 76, GEOMATE International Society, 2017, [Peer-reviewed]
English, Scientific journal

Effect of acid rain on geotechnical properties of residual soils
Zeinab Bakhshipour, Afshin Asadi, Bujang B. K. Huat, A. Sridharan, Satoru Kawasaki
SOILS AND FOUNDATIONS, 56, 6, 1008, 1020, Dec. 2016, [Peer-reviewed]
English, Scientific journal

Evaluation of porosity in biogrouted sand using microfocus X-ray CT　　　　　　　　　　　　　　　
Shumpei Mitsuyama, Kazunori Nakashima, Satoru Kawasaki
Proceedings of the Sixth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2016), 145, 150, Nov. 2016, [Peer-reviewed]
English, International conference proceedings

Effects of various powders on strength reinforcement of calcium phosphate compounds precipitated in sand specimens　　　　　　　　　　　　　　　
Dilrukshi, R.A.N, Kawasaki, S
Abstract Proceedings of International Doctoral Symposium on Sustainable Management of Resources and Environment in the 21st Century, 8, Nov. 2016, [Peer-reviewed]
English, International conference proceedings

Anthropogenic Beachrock for Eco-Environment Shoreline Development　　　　　　　　　　　　　　　
L. R. Daryono, A. D. Titisari, I. W. Warmada, S. Kawasaki
The 2nd International Conference on Science and Technology 2016 (ICST2016), Oct. 2016, [Peer-reviewed]
English, International conference proceedings

Strength reinforcement of sand test specimens cemented with calcium phosphate compounds and different powders　　　　　　　　　　　　　　　
R.A.N. Nadeeka, S. Kawasaki
Proceedings of the 9th Asian Rock Mechanics Symposium, ARMS9-RMC3-P86, Oct. 2016, [Peer-reviewed]
English, International conference proceedings

Coral sand solidification test through microbial calcium carbonate precipitation using Pararhodobacter sp.　　　　　　　　　　　　　　　
Md. Nakibul, Hasan Khan, S. Shimazaki, S. Kawasaki
International Journal of GEOMATE, 11, 26, 2665, 2670, Oct. 2016, [Peer-reviewed]
English, Scientific journal

Comparison of Cementation Mechanism between Natural Beachrock and Anthropogenic Beachrock, Case Study: Okinawa Island, Japan　　　　　　　　　　　　　　　
L. R. Daryono, A. D. Titisari, I. W. Warmada, S. Kawasaki
The 41st Scientific Annual Meeting of Indonesian Association of Geophysicists, PITHAGI2016-042, Sep. 2016, [Peer-reviewed]
International conference proceedings

Plant-derived urease induced sand cementation used in geotechnical engineering applications　　　　　　　　　　　　　　　
R. A. N. Dilrukshi, Satoru Kawasaki
Proceedings of the International Conference on Geomechanics, Geo-energy and Geo-resources IC3G 2016, Theme 7-100, Theme 7-107, Sep. 2016, [Peer-reviewed]
English, International conference proceedings

Strengthening of sand cemented with calcium phosphate compounds using plant-derived urease　　　　　　　　　　　　　　　
R. A. N. Dilrukshi, Jun Watanabe, Satoru Kawasaki
International Journal of GEOMATE, 11, 25, 2461, 2467, Sep. 2016, [Peer-reviewed]
English, Scientific journal

Development of biogrouting using plant-derived urease and calcium phosphate compound　　　　　　　　　　　　　　　
M. Takatsu, R. A. N. Dilrukshi, S. Kawasaki
Proceedings of the 50th US Rock Mechanics / Geomechanics Symposium, ARMA 16-471, Jun. 2016, [Peer-reviewed]
English, International conference proceedings

Soil reinforcement using calcium phosphate compounds　　　　　　　　　　　　　　　
S. Kawasaki, M. Akiyama
ASEAN Engineering Journal, Part C, 5, 1, 5, 13, Jun. 2016, [Peer-reviewed], [Invited]
English, Scientific journal

Possibility for solidification of peaty soil by using microbes
Atsuko Sato, Satoru Kawasaki, Toshiro Hata, Toshihiro Hayashi
International Journal of GEOMATE, 10, 22, 2071, 2076, Jun. 2016, [Peer-reviewed]
English, Scientific journal

Study of beachrocks in East Attica　　　　　　　　　　　　　　　
A. Karkani, N. Evelpidou, H. Maroukian, S. Kawasaki
Bulletin of the Geological Society of Greece, 50, 1, 434, 440, May 2016, [Peer-reviewed]
English, Scientific journal

Biogrout: A Novel Binding Material for Soil Improvement and Concrete Repair
Varenyam Achal, Satoru Kawasaki
FRONTIERS IN MICROBIOLOGY, 7, 314, Mar. 2016, [Peer-reviewed]
English, Scientific journal

Microbially Induced Sand Cementation Method Using Pararhodobacter sp Strain SO1, Inspired by Beachrock Formation Mechanism
Takashi Danjo, Satoru. Kawasaki
MATERIALS TRANSACTIONS, 57, 3, 428, 437, Mar. 2016, [Peer-reviewed]
English, Scientific journal

Sand solidification through microbially induced carbonate precipitation for erosion control: Prospects in Bangladesh　　　　　　　　　　　　　　　
M. N, H. Khan, S. Kawasaki, M. R. Hassan
Journal of Environmental Science and Natural Resources, 9, 1, 59, 61, 2016, [Peer-reviewed]
English, Scientific journal

Sand Cementation Using the pH Dependency of Calcium Phosphate Compounds and the Addition of Various Powders
R. A.N. Dilrukshi, S. Kawasaki
Geotechnical Special Publication, 2016-, 269, 104, 115, American Society of Civil Engineers (ASCE), 2016, [Peer-reviewed]
English, International conference proceedings

Factors Affecting the Improvement of Sand Properties Treated with Microbially-Induced Calcite Precipitation
G. G.N.N. Amarakoon, S. Kawasaki
Geotechnical Special Publication, 2016-, 269, 72, 83, American Society of Civil Engineers (ASCE), 2016, [Peer-reviewed]
English, International conference proceedings

Experimental study on ground solidification using ureolytic bacteria　　　　　　　　　　　　　　　
A. Yaegashi, T. Danjo, S. Kawasaki
第44回岩盤力学に関するシンポジウム講演集, 268, 272, Jan. 2016
English, Symposium

Effective use of plant-derived Urease in the field of geoenvironmental/geotechnical engineering　　　　　　　　　　　　　　　
R. A. N. Dilrukshi, Satoru Kawasaki
Journal of Civil and Environmental Engineering, 6, 1, Jan. 2016, [Peer-reviewed]
English, Scientific journal

Fundamental study on peat solidification technology using microorganisms
A. Sato, S. Kawasaki, T. Hata, T. Yamanashi, S. Nishimoto
Journal of Japan Society of Civil Engineers, Ser.C (Geosphere Engineering), 71, 4, 427, 439, Dec. 2015, [Peer-reviewed]
Japanese, Scientific journal

Artificial beachrock formation through sand solidification towards the inhibit of coastal erosion in Bangladesh　　　　　　　　　　　　　　　
Md. Nakibul, Hasan Khan, Takashi Danjo, Satoru Kawasaki
International Journal of GEOMATE, 9, 2, 1528, 1533, Dec. 2015, [Peer-reviewed]
English

Mechanical property of sand cemented with calcium phosphate compounds using plant-derived urease　　　　　　　　　　　　　　　
R. A. N. Dilrukshi, J. Watanabe, S. Kawasaki
Proceedings of the Fifth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2015), 84, 89, Nov. 2015, [Peer-reviewed]
English, International conference proceedings

Estimating urease activity in microorganism of peat based on electric conductivity　　　　　　　　　　　　　　　
A. Sato, S. Kawasaki, T. Hata, T. Yamanashi
Proceedings of the Fifth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2015), 426, 429, Nov. 2015, [Peer-reviewed]
English, International conference proceedings

Coral sand solidification test through microbial carbonate precipitation using Pararhodobacter sp.　　　　　　　　　　　　　　　
Md. Nakibul, Hasan Khan, S. Shimazaki, S. Kawasaki
Proceedings of the Fifth International Conference of Geotechnique, Construction Materials and Environment (GEOMATE 2015), 131, 137, Nov. 2015, [Peer-reviewed]
English, International conference proceedings

Bio-grout based on microbially induced sand solidification by means of asparaginase activity
Mengmeng Li, Qing-Long Fu, Qiuzhuo Zhang, Varenyam Achal, Satoru Kawasaki
SCIENTIFIC REPORTS, 5, Nov. 2015, [Peer-reviewed]
English, Scientific journal

Coral Sand Solidification Test Based on Microbially Induced Carbonate Precipitation Using Ureolytic Bacteria
Md. Nakibul Hasan Khan, G. G. N. N. Amarakoon, Suguru Shimazaki, Satoru Kawasaki
MATERIALS TRANSACTIONS, 56, 10, 115, 122, Oct. 2015, [Peer-reviewed]
English, Scientific journal

Aging behaviour of organic matter decomposition and microstructure of coal using hydrogen peroxide for bio-methane production in subsurface environment
Noritaka Aramaki, Shuji Tamamura, Sho Tanaka, Satoru Kawasaki, Yoshiaki Fujii, Katsuhiko Kaneko
Japanese Geotechnical Journal, 10, 3, 391, 401, The Japanese Geotechnical Society, Sep. 2015, [Peer-reviewed]
English, Scientific journal

Sand Cementation Test using Plant-Derived Urease and Calcium Phosphate Compound
R. A. N. Dilrukshi, Jun Watanabe, Satoru Kawasaki
MATERIALS TRANSACTIONS, 56, 9, 1565, 1572, Sep. 2015, [Peer-reviewed]
English, Scientific journal

Compressive strength of sand cemented with calcium phosphate compound　　　　　　　　　　　　　　　
G. G. N, N. Amarakoon, S. Kawasaki
Proceedings of the International Conference on Geotechnical Engineering ICGE Colombo 2015, 197, 200, Aug. 2015, [Peer-reviewed]
English, International conference proceedings

Present status of ground improvement technologies using microbial functions
KAWASAKI Satoru
Journal of MMIJ, 131, 5, 155, 163, May 2015, [Peer-reviewed]
Japanese, Scientific journal

Novel microbial based low energy green building material production technology　　　　　　　　　　　　　　　
Mengmeng Li, Satoru Kawasaki, Qiuzhuo Zhang, Varenyam Achal
Advanced Materials Research, 1090, 96, 100, Feb. 2015, [Peer-reviewed]
English, Scientific journal

Coral sand solidification test using ureolytic bacteria
T. Danjo, S. Kawasaki, S. Shimazaki, K. Koizuka
Geomechanics from Micro to Macro, Vols I and II, 1521, 1526, 2015, [Peer-reviewed]
English, International conference proceedings

Formation of artificial beachrock towards inhibit of coastal erosion in Bangladesh: A review
Md. Nakibul H. Khan, Satoru Kawasaki
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability, 1123, 1127, Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, 2015, [Peer-reviewed]
English, International conference proceedings

Effect on unconfined compressive strength of sand test pieces cemented with calcium phosphate compound　　　　　　　　　　　　　　　
G. G. N, N. Amarakoon, T. Koreeda, S. Kawasaki
International Journal of GEOMATE, 7, 2, 1069, 1074, Dec. 2014, [Peer-reviewed]
English, Scientific journal

Effect on unconfined compressive strength of sand test pieces cemented with calcium phosphate compound by addition of scallop shell powder　　　　　　　　　　　　　　　
G. G. N, N. Amarakoon, T. Koreeda, S. Kawasaki
Proceedings of the Fourth International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2014), 50, 55, Nov. 2014, [Peer-reviewed]
English, International conference proceedings

Improvement in the unconfined compressive strength of sand test pieces cemented with calcium phosphate compound　　　　　　　　　　　　　　　
G. G. N, N. Amarakoon, T. Koreeda, S. Kawasaki
Proceedings of the 8th Asian Rock Mechanics Symposium, 276, 282, Oct. 2014, [Peer-reviewed]
English

Effects of bacterial ureolysis and seawater evaporation on beachrock formation　　　　　　　　　　　　　　　
T. Danjo, S. Kawasaki, S. Shimazaki, K. Koizuka
Proceedings of the 8th Asian Rock Mechanics Symposium, 270, 275, Oct. 2014, [Peer-reviewed]
English

Microstructure of brown coal in hydrogen peroxide solution observed by employing X-ray computed tomography　　　　　　　　　　　　　　　
N. Aramaki, S. Tamamura, S. Shimizu, A. Ueno, Y. Ohmi, K. Kaneko, S. Tanaka, S. Kawasaki
Proceedings of the 8th Asian Rock Mechanics Symposium, 1579, 1588, Oct. 2014, [Peer-reviewed]
English

Effect of liquefaction countermeasures for sand cemented by microbial metabolism　　　　　　　　　　　　　　　
Y. Inagaki, M. Tsukamoto, T. Sasaki, S. Kawasaki
Proceedings of the 8th Asian Rock Mechanics Symposium, 920, 929, Oct. 2014, [Peer-reviewed]
English, International conference proceedings

Improvement in the Unconfined Compressive Strength of Sand Test Pieces Cemented with Calcium Phosphate Compound by Addition of Calcium Carbonate Powders
G. G. N. N. Amarakoon, Takefumi Koreeda, Satoru Kawasaki
MATERIALS TRANSACTIONS, 55, 9, 1391, 1399, Sep. 2014, [Peer-reviewed]
English, Scientific journal

Segmentation of multi-phase X-ray computed tomography images　　　　　　　　　　　　　　　
Masaji Kato, Manabu Takahashi, Satoru Kawasaki, Katsuhiko Kaneko
Environmental Geotechnics, 2, 2, 104, 117, Mar. 2014, [Peer-reviewed]
English, Scientific journal

Electrokinetic properties of pasteurii and aquimarina bacteria　　　　　　　　　　　　　　　
Hamed A. Keykha, Bujang B. K. Huat, Afshin Asadi, Mohsen Zareian, Satoru Kawasaki
Environmental Geotechnics, 2, 3, 181, 188, Mar. 2014, [Peer-reviewed]
English, Scientific journal

Electrical disintegration and micro-focus X-ray CT observations of cement paste samples with dispersed mineral particles
Sang Ho Cho, Mitsuhiro Yokota, Mayumi Ito, Satoru Kawasaki, Soo Bok Jeong, Byoung Kon Kim, Katsuhiko Kaneko
MINERALS ENGINEERING, 57, 79, 85, Mar. 2014, [Peer-reviewed]
English, Scientific journal

Formation Mechanisms of Beachrocks in Okinawa and Ishikawa, Japan, with a Focus on Cements
Takashi Danjo, Satoru Kawasaki
MATERIALS TRANSACTIONS, 55, 3, 493, 500, Mar. 2014, [Peer-reviewed]
English, Scientific journal

Geological Exploration of Beachrock through Geophysical Surveying on Yagaji Island, Okinawa, Japan
Ryosuke Kubo, Satoru Kawasaki, Koichi Suzuki, Shinji Yamaguchi, Toshiro Hata
MATERIALS TRANSACTIONS, 55, 2, 342, 350, Feb. 2014, [Peer-reviewed]
English, Scientific journal

Characteristics of Beachrocks: A Review
Takashi Danjo, Satoru Kawasaki
Geotechnical and Geological Engineering, 32, 2, 215, 246, Kluwer Academic Publishers, 2014, [Peer-reviewed]
English, Scientific journal

Formation mechanisms of beachrocks in okinawa and Ishikawa, Japan, with a focus on cements
Takashi Danjo, Satoru Kawasaki
Materials Transactions, 55, 3, 493, 500, 2014, [Peer-reviewed]
English, Scientific journal

Soil reinforcement using calcium phosphate compounds　　　　　　　　　　　　　　　
Kawasaki, S, Akiyama, M
Proceedings of International Conference on Georesources and Geological Engineering, 412, 421, Dec. 2013, [Peer-reviewed], [Invited]
English, International conference proceedings

Enhancement of unconfined compressive strength of sand test pieces cemented with calcium phosphate compound by addition of various powders
S. Kawasaki, M. Akiyama
SOILS AND FOUNDATIONS, 53, 6, 966, 976, Dec. 2013, [Peer-reviewed]
English, Scientific journal

Geological structure of beachrock by geophysical exploration: applicayio to Yagaji Island in Okinawa, Japan　　　　　　　　　　　　　　　
Kubo, R, Kawasaki, S, Suzuki, K, Yamaguchi, S, Hata, T
Proceedings of the 11th Society of Exploration Geophysics of Japan International Symposium, Paper ID: 051, Nov. 2013, [Peer-reviewed]
English, International conference proceedings

A study of the formation mechanism of beachrock in Okinawa, Japan: Toward making artificial rock　　　　　　　　　　　　　　　
Danjo, T, Kawasaki, S
Proceedings of the Third International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2013), 101, 106, Nov. 2013, [Peer-reviewed]
English, International conference proceedings

Effect of Addition of Phosphate Powder on Unconfined Compressive Strength of Sand Cemented with Calcium Phosphate Compound
Satoru Kawasaki, Masaru Akiyama
MATERIALS TRANSACTIONS, 54, 11, 2079, 2084, Nov. 2013, [Peer-reviewed]
English, Scientific journal

Geological structure of beachrock using electrical resistivety and surface wave - Application to the coastal area at Yagaji island in Nago-shi, Okinawa -
Suzuki, K, Kawasaki, S, Kubo, R, Yamaguchi, S, Hata, T
BUTSURI-TANSA Geophysical Exploration, 66, 4, 277, 285, The Society of Exploration Geophysicists of Japan, Oct. 2013, [Peer-reviewed]
Japanese, Scientific journal, Previous studies of artificial bedrock with self-repair ability in coastal area have indicated the important of building coastal levees at low cost with minimal environment load. The goal is to form the extreme artificial bedrock using natural materials (e.g., microbes, sand, shell, pieces of coral, and seaweed etc.) in a short time that can tolerate climate conditions. Most studies have focused on beachrocks in tropical and subtropical coral reef coastal areas, but little research has been done on the subsurface structure. Therefore, we performed both a DC electrical survey and a surface wave survey along the same lines to elucidate the subsurface structure of beachrocks in the coastal area of Okinawa Prefecture, Japan. In addition, we measured the physical properties of the beachrock sample collected from the survey lines by laboratory tests. As the results, both the resistivity and the shear wave velocity of the beachrock were higher than those of the underlying unconsolidated sand layer. Furthermore, the beachrock is up to approximately 1 m thick, increasing toward the coastline.

Estimation of regional stress state and Young's modulus by back analysis of mining-induced deformation
J. Kodama, T. Miyamoto, S. Kawasaki, Y. Fujii, K. Kaneko, P. Hagan
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 63, 1, 11, Oct. 2013, [Peer-reviewed]
English, Scientific journal

Beachrock mapping by geophysical exploration: Application to Yagaji Island in Okinawa, Japan
Kubo, R, Kawasaki, S, Suzuki, K, Yamaguchi, S, Hata, T
Proceedings of EUROCK 2013 - The ISRM International Symposium, Rock Mechanics for Resources, Energy and Environment, 299, 304, Sep. 2013, [Peer-reviewed]
English, International conference proceedings

A study of the formation mechanism of beachrock in Okinawa, Japan: toward making artificial rock
Danjo, T, Kawasaki, S
International Journal of GEOMATE, 5, 1, 634, 639, The GEOMATE International Society, Sep. 2013, [Peer-reviewed]
English, Scientific journal

Formation mechanisms of beachrocks based on cement materials
Danjo, T, Kawasaki, S
Journal of the Mining and Materials Processing Institute of Japan, 129, 7, 520, 528, The Mining and Materials Processing Institute of Japan, Jul. 2013, [Peer-reviewed]
Japanese, Scientific journal, Beachrocks are coastal deposits cemented mainly by calcium carbonate cement; these deposits are found in the tidal zone of sandy beaches in tropical and subtropical regions. Manmade beachrocks have the potential to inhibit coastal erosions; considering this important application, we performed field investigations and laboratory tests to understand the formation mechanisms of beachrocks in Okinawa and Ishikawa, Japan. We performed a needle penetration test, determination of viable count, elemental analyses and mineral analysis. Our investigation of the formation mechanisms of the beachrocks showed that in Okinawa, the evaporation of seawater and/or urease activity of the microorganisms may have resulted in the precipitation of high Mg calcite (HMC), leading to the formation of beachrocks. On the other hand, in Ishikawa, beachrocks and sand were present near a spring. Here, the pH value of the spring was in the range 4.7 and it has a higher concentration of Al³⁺. The mixing of spring water with seawater could have led to the precipitation of the cement containing Al and Si between sand particles and, thus resulting in the formation of the beachrock. Therefore, we have interpreted the formation mechanisms of beachrocks.

Geological structure of beachrock using electrical resistivity and surface wave surveys Application to the coastal area at Yagaji island in Nago-shi, Okinawa
SUZUKI Koichi, KAWASAKI Satoru, KUBO Ryosuke, YAMAGUCHI Shinji, HATA Toshiro
物理探査学会学術講演会講演論文集 = Proceeding of the SEGJ Conference, 128, 150, 153, 物理探査学会, 13 Jun. 2013
Japanese

Unique grout material composed of calcium phosphate compounds
Kawasaki, S, Akiyama, M
International Journal of GEOMATE, 4, 1, 429, 435, The GEOMATE International Society, Mar. 2013, [Peer-reviewed]
English, Scientific journal

Evaluation of Porosity and Its Variation in Porous Materials Using Microfocus X-ray Computed Tomography Considering the Partial Volume Effect
Masaji Kato, Manabu Takahashi, Satoru Kawasaki, Toshifumi Mukunoki, Katsuhiko Kaneko
MATERIALS TRANSACTIONS, 54, 9, 1678, 1685, 2013, [Peer-reviewed]
English, Scientific journal

Influencing factors of strength increase of beachrocks　　　　　　　　　　　　　　　
Danjo, T, Kawasaki, S
Proceedings of the 13th Japan Symposium on Rock Mechanics & the 6th Japan-Korea Joint Symposium, 617, 622, Jan. 2013
Japanese, Symposium

Unique grouting material composed of calcium phosphate compounds　　　　　　　　　　　　　　　
Kawasaki, S, Akiyama, M
Proceedings of the Second International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2012), 40, 46, Nov. 2012, [Invited]
English, International conference proceedings

Electrophoresis of bacteria and electro-biogrouting　　　　　　　　　　　　　　　
Hamed A. Keykha, Bujang B. K. Huat, Afshin Asadi, S. Kawasaki
Proceedings of the Second International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2012), 230, 233, Nov. 2012
English, International conference proceedings

Physical and mechanical properties of beachrocks in Okinawa Island
Danjo, T, Kawasaki, S
Journa of Japan Society of Engineering Geology, 53, 4, 191, 200, Japan Society of Engineering Geology, Oct. 2012, [Peer-reviewed]
Japanese, Scientific journal, There are very few reports about physical and mechanical properties of beachrocks in the world. To obtain the properties of beachrocks and to investigate their correlations between unconfined compression strength and other properties such as density, water content, etc., we performed a series of in-situ tests and laboratory tests for beachrocks in Okinawa Island. As a result, it was shown that the average values of unconfined compression strengths of the beachrock samples obtained from three testing sites were 11.14MPa, 19.91MPa and 42.23MPa, respectively. It was also understood that density and unconfined compression strength of the beachrocks increased along with the passage of time while water content decreased. Moreover, it was found that there was a relationship like qu = 0.00000654 t2+0.0101 t between unconfined compression strength, qu (MPa), and calibrated radiocarbon age, t(y Cal BP).

Improvement in the unconfined compressive strength of sand test pieces cemented with calcium phosphate compound by addition of calcium carbonate
Masaru Akiyama, Satoru Kawasaki
ECOLOGICAL ENGINEERING, 47, 264, 267, Oct. 2012, [Peer-reviewed]
English, Scientific journal

Effect of the addition of various powders on unconfined compressive strength of cemented sand with calcium phosphate compound
Akiyama, M, Kawasaki, S
Jiban Kogaku Janaru (Japanese Geotechnical Journal), 7, 3, 491, 501, Sep. 2012, [Peer-reviewed]
Japanese, Scientific journal

Segmentation of multi-phase X-ray computed tomography images of porous materials considering partial volume effect　　　　　　　　　　　　　　　
Kato, M, Yamanaka, H, Takahashi, M, Kawasaki, S, Kaneko, K
Proceedings of the 2012 World Congress on Advances in Civil, Environmental, and Materials Research (ACEM' 12), 278, 294, Aug. 2012
English, International conference proceedings

Characteristcs of beachrock based on bibliographocal research: Toward the development of man-made beachrock
Danjo, T, Kawasaki, S
Journal of Japan Society of Engineering Geology, 53, 3, 129, 141, 日本応用地質学会, Aug. 2012, [Peer-reviewed]
Japanese, Scientific journal

Properties of beachrocks in Okinawa and Ishikawa, Japan　　　　　　　　　　　　　　　
Danjo, T, Kawasaki, S
Proceedings of the 34th International Geological Congress, 1521, Aug. 2012
English, Scientific journal

Microbially mediated sand solidification using calcium phosphate compounds
Masaru Akiyama, Satoru Kawasaki
ENGINEERING GEOLOGY, 137, 29, 39, Jun. 2012, [Peer-reviewed]
English, Scientific journal

Electro-Biogrouting and Its Challenges
Hamed A. Keykha, Bujang B. K. Huat, Afshin Asadi, Satoru Kawasaki
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, 7, 2, 1196, 1204, Feb. 2012, [Peer-reviewed]
English, Scientific journal

Experimental study of the calcite precipitation based on the urease production bacterium isolated from peat
Hata, T, Sato, A, Kawasaki, S, Abe, H
Journal of Japan Society of Civil Engineers, Ser.C (Geosphere Engineering), 68, 1, 31, 40, 2012, [Peer-reviewed]
Japanese, Scientific journal

Physical and mechanical properties of beachrock　　　　　　　　　　　　　　　
Danjo, T, Kawasaki, S
Proceedings of the 41st Symposium on Rock Mechanics, 89, 94, 2012
Japanese, Symposium

Novel grout material comprised of calcium phosphate compounds: In vitro evaluation of crystal precipitation and strength reinforcement
Masaru Akiyama, Satoru Kawasaki
ENGINEERING GEOLOGY, 125, 119, 128, Jan. 2012, [Peer-reviewed]
English, Scientific journal

New grouting materials using calcium phosphate compounds
M. Akiyama, S. Kawasaki
HARMONISING ROCK ENGINEERING AND THE ENVIRONMENT, 1449, 1452, 2012
English, International conference proceedings

Property evaluation of beachrock based on field investigation in Okinawa Island, Japan
T. Danjo, S. Kawasaki
HARMONISING ROCK ENGINEERING AND THE ENVIRONMENT, 949, 952, 2012
English, International conference proceedings

Fundamental study on new grouting material using calcium phosphate compounds: Effect of addition of ammonia sources and soil microorganisms on unconfined compression strength
Akiyama, M, Kawasaki, S, Aoi, S
Jiban Kogaku Janaru (Japanese Geotechnical Journal), 6, 4, 513, 524, 2011, [Peer-reviewed]
Japanese, Scientific journal

Ground improvement technologies using microbial functions　　　　　　　　　　　　　　　
Kawasaki, S
Ground Engineering, 29, 1, 11, 18, 2011, [Peer-reviewed], [Invited]
Japanese, Scientific journal

Relationship between crystal features of calcium phosphate compounds in chemical grout and unconfined compression strength of grouted sand　　　　　　　　　　　　　　　
Aoi, S, Kawasaki, S, Akiyama, M
Proceedings of International Conference "Environmental Geosciences and Engineering Survey for Territory Protection and Population Safety", 504, 508, 2011
English, International conference proceedings

Fundamental study on new grouting material using calcium phosphate compounds: Crystal precipitation test and unconfined compression test of sand test pieces
Akiyama, M, Kawasaki, S
Jiban Kogaku Janaru (Japanese Geotechnical Journal), 6, 2, 341, 350, 2011, [Peer-reviewed]
Japanese, Scientific journal

Segmentation of internal structure of two-phase materials using micro-focus X-ray CT,
Yamanaka, H, Kawasaki, S, Kato, M, Mukunoki, T, Kaneko, K
Jaban Kogaku Janaru (Japanese Geotechnical Journal), 6, 2, 273, 284, 2011, [Peer-reviewed]
Japanese, Scientific journal

A centrifugal model test of microbial carbonate precipitation as liquefaction countermeasure
Inagaki, Y., Tsukamoto, M., Mori, H., Nakajima, S., Sasaki, T., Kawasaki, S.
Jiban Kogaku Janaru (Japanese Geotechnical Journal), 6, 2, 157, 167, 2011, [Peer-reviewed]
Japanese, Scientific journal

Basic study on development of bio-cover soil applying microbial metabolism
Mukunoki, T, Kawasaki, S, Shimoyashiki, A, Yoshinaga, T
Jiban Kogaku Janaru (Japanese Geotechnical Journal), 5, 4, 545, 553, 2010, [Peer-reviewed]
Japanese, Scientific journal

Examination of applicability of injection pipe that uses biodegradable plastic in the ground improvement
Terajima, R, Shimada, S, Oyama, T, Kawasaki, S
Jiban Kogaku Janaru (Japanese Geotechnical Journal), 5, 3, 425, 435, 2010, [Peer-reviewed]
Japanese, Scientific journal

Estimation of regional stress state and Young's modulus by analyzing mining induced deformation
E. Nishiyama, T. Miyamoto, J. Kodama, S. Kawasaki, K. Kaneko, Y. Yoshida
ROCK MECHANICS IN CIVIL AND ENVIRONMENTAL ENGINEERING, 681, 684, 2010
English, International conference proceedings

Effect of temperature on precipitation of calcium carbonate using soil microorganisms
Kawasaki, S, Ogata, S, Hiroyoshi, N, Tsunekawa, M, Kaneko, K, Terajima, R
Journal of Japan Society of Engineering Geology, 51, 1, 10, 18, Japan Society of Engineering Geology, 2010, [Peer-reviewed]
Japanese, Scientific journal, We have been performing fundamental laboratory tests in order to develop a novel conceptual grout, hereafter called biogrout. Hardened biogrout consists primarily of calcium carbonate or silica, typical cement elements in soil and rock. These compounds can fill the voids and cracks in soil and rock using microbial metabolism. This paper reports some test results for biogrout using calcium carbonate and discusses them. We performed a series of precipitation tests on calcium carbonate in test tubes using soil microorganisms sampled from various parts of Japan, examining the effect of temperature on the precipitation of calcium carbonate when testing. As a result, it was indicated that precipitation of calcium carbonate using soil microorganisms occurred at temperatures ranging from 5 to 35°C. Furthermore, we measured the number of soil microorganisms used in the tests and conducted gene analyses of them. The phases of soil microorganisms before testing were compared to those after testing by determining the number of living soil microorganisms, the highest relative frequency of soil microorganisms, and their attributive taxonomical groups. In consequence, it is possible that fungi such as the Penicillium and Aspergillus species frequently metabolized organic nutrition, and at the same time their number increased via their metabolism.

Study on impact assessment of pH and organic nutrient source in solvents for production of bio-cover soil due to microbial metabolism
Mukunoki, T, Yoshinaga, T, Kawasaki, S
Jiban Kogaku Janaru (Japanese Geotechnical Journal), 5, 1, 69, 80, 2010, [Peer-reviewed]
Japanese, Scientific journal

Evaluation of porosity in geomaterials treated with biogrout considering partial volume effect
Kobayashi, Y, Kawasaki, S, Kato, M, Mukunoki, T, Kaneko, K
Proceedings of the 3rd International Workshop on X-Ray CT for Geomaterials: GeoX 2010, 287, 294, 2010, [Peer-reviewed]
English, International conference proceedings

X線CT法によるバイオグラウト処理された供試体内部の間隙率評価　　　　　　　　　　　　　　　
小林優矢, 川﨑了, 加藤昌治, 椋木俊文, 金子勝比古
第39回岩盤力学に関するシンポジウム講演集, 213, 217, 2010
Japanese, Symposium

Applicability of a method for evaluation of porosity to biogrouted geomaterials
Kobayashi, Y, Kawasaki, S, Kato, M, Mukunoki, T, Kaneko, K
Journal of the Mining and Materials Processing Institute of Japan, 125, 10/11, 540, 546, The Mining and Materials Processing Institute of Japan, 2009, [Peer-reviewed]
Japanese, Scientific journal, This study considers a method for evaluation of porosity of biogrouted geomaterials. First, we visualized the internal structures of the specimens by using micro-focused X-ray CT scanner. We tested Souma sand, gum tips, plastic pellets, steel balls and glass beads as geomaterial to find suitable geomaterials for evaluation of porosity: geomaterials whose CT-number histogram was bimodal. The results clarified that one of the geomaterials, glass beads whose particle size was 0.50-0.71mm, was suitable for evaluation of porosity. Second, we calculated the porosity of the glass beads by using a method for evaluation of porosity based on a maximum likelihood thresholding method considering the effect of mixels. The result showed that the ratio of the porosity of grouted geomaterial to that of ungrouted geomaterial was 0.98 to 0.99. On the other hand, the value estimated by the measurement of changes in concentration of calcium ion was 0.98. Thus, both values closely agreed. Therefore, this study clarifies that the method enables us to evaluate small change in porosity with great accuracy.

Temperature dependence of calcium carbonate precipitation for biogrout　　　　　　　　　　　　　　　
Ogata, S, Kawasaki, S, Hiroyoshi, N, Tsunekawa, M, Kaneko, K, Terajima, R
Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009, 339, 344, 2009
English, International conference proceedings

Solidification of dredged clayey soil from farm ponds based on biochemical grouting
Kiyota, K, Murakami, A, Kawasaki, S
Journal of Japan Society of Engineering Geology, 50, 2, 70, 78, Japan Society of Engineering Geology, 2009, [Peer-reviewed]
Japanese, Scientific journal, Soils dredged from the farm ponds to improve the water quality and the efficiency of storage of reservoirs cannot easily be dealt with or transferred to be reused because of high water content. In this paper, a series of laboratory experiments is carried out to examine a solidification procedure of such soil based on the biochemical grouting technique, e.g., the biogrout, instead of existing procedure using chemical solidification mixture which fills the fissure and the pore in soil using microorganic metabolism with colloidal silica. It is revealed from the test tube experiments that a set of 5ml of colloidal Silica, 1.25g of yeast and 0.3g of glucose is effective in dealing with 5g of dredged soil. Existing microorganism and organic nourishment source nutrition involved dredged soil is applicable to the biochemical reaction through the examination of the compounding ratio of the biochemical grout to the dredged soil, and the amount of dredged soil to be necessary for solidification within the biochemical grout processing. It is also found that the biogrout declines the plastic index of dredged soil and solidify the soil by comparing the penetration of the fall cone test before and after the biochemical grout processing under the same water contents.

Effect of temperature on rate of CaCO₃ precipitation for biogrouting process　　　　　　　　　　　　　　　
Ogata, S, Kawasaki, S, Hiroyoshi, N, Tsunekawa, M, Kaneko, K, Terajima, R
Proceedings of 3rd International Workshop and Conference on Earth Resources Technology, 12, 17, 2009, [Peer-reviewed]
English, International conference proceedings

Fundamental study of siliceous biogrout for eco-friendly soil improvement
Terajima, R, Shimada, S, Oyama, T, Kawasaki, S
Journal of Geotechnical Engineering, Japan Society of Civil Engineers, C, 65, 1, 120, 130, 2009, [Peer-reviewed]
Japanese, Scientific journal

微生物代謝を利用したグラウトにおける炭酸カルシウム析出の温度依存性　　　　　　　　　　　　　　　
小潟暁, 川﨑了, 広吉直樹, 恒川昌美, 金子勝比古, 寺島麗
第38回岩盤力学に関するシンポジウム講演論文集, 120, 124, 2009
Japanese, Symposium

Effect of temperature on precipitation of calcium carbonate for biogrout　　　　　　　　　　　　　　　
Ogata, S, Kawasaki, S, Hiroyoshi, N, Tsunekawa, M, Kaneko, K, Terajima, R
Proceedings of the Korean Rock Mechanics Symposium 2008 -International Cooperation and Rock Engineering for Development of Mineral Resources and Infrastructures-, 271, 277, 2008
English, International conference proceedings

Estimation of regional stress state and Young’s modulus by measurement of mining induced deformation
Nishiyama, E, Miyamoto, T, Kodama, J, Kawasaki, S, Kaneko, K
Journal of the Mining and Materials Processing Institute of Japan, 124, 9, 570, 575, The Mining and Materials Processing Institute of Japan, 2008, [Peer-reviewed]
Japanese, Scientific journal, A method to evaluate the regional stresses and the Young's modulus by analyzing mining induced deformation of the ground is proposed.
Mining induced deformation is interpreted as the deformation due to the geometrical change of the ground surface caused by mine activity and it is classified in two types, i.e., the displacement increment induced by gravity and that by the horizontal regional strain. It is pointed out that both the regional strain and Young's modulus can be estimated by analyzing the mining induced deformation, because the displacement induced by the regional strain is independent of the Young's modulus and the displacement induced by the gravity is inversely proportional to the Young's modulus.
The relative displacement due to mine excavation in Torigatayama mine were measured by GPS (Global Positioning System) and the regional stress state and Young's modulus were estimated by a back-analysis using three dimensional finite element method. It is shown that the maximum principal direction of regional stresses is almost NE-SW and Young's modulus of the ground is 3 to 6GPa in the present field.

鳥形山鉱山における広域応力と地盤ヤング率の検討　　　　　　　　　　　　　　　
西山えるむ, 宮本高充, 児玉淳一, 川﨑了, 金子勝比古
第12回岩の力学国内シンポジウム講演論文集, 281, 287, 2008
Japanese, Symposium

微生物代謝を用いたシリカ系注入材バイオグラウトの開発　　　　　　　　　　　　　　　
寺島麗, 島田俊介, 小山忠雄, 市川智史, 川﨑了, 広吉直樹
第12回岩の力学国内シンポジウム講演論文集, 239, 244, 2008
Japanese, Symposium

バイオグラウトにおける炭酸カルシウムの析出に及ぼす温度の影響　　　　　　　　　　　　　　　
川﨑了, 小潟暁, 広吉直樹, 恒川昌美, 金子勝比古, 寺島麗
地盤工学会北海道支部技術報告集, 48, 27, 30, 2008
Japanese, Symposium

Estimation of Weathering Thickness of Man-made Weathering Rocks with the Equotip Hardness Tester
Satoru KAWASAKI, Sang Ho CHO, Katsuhiko KANEKO
Journal of the Japan Society of Engineering Geology, 48, 4, 162, 169, Japan Society of Engineering Geology, 2007
Japanese, In general, rocks are oxidized and weathered when they are exposed to the surface of the earth by natural erosions or man-made excavations. As a consequence, the strength of rocks that suffered such weathering decreases in the end. Provided that a new method which can estimate weathering thickness of rocks nondestructively, simply and quantitatively in the fields is developed, it is expected that the method is useful for the practical fields such as engineering geology, geotechnical engineering and so forth. In order to develop a new estimation method for weathering thickness of rocks like boring cores or relatively shallow weathering layers of outcropping rock masses, the authors produced four kinds of man-made weathering rocks modeled on natural weathering rocks. Then a series of Equotip rebound hardness tests was conducted by using man-made weathering rocks. Furthermore, an experimental investigation was carried out by taking notice of especially weathering thickness of man-made weathering rocks and the ratio of weathering layers to nonweathering layers in rebound hardness. In this paper, firstly the man-made weathering rock model by which weathering thickness of weathering rocks and shallow weathering layers of rock masses can be estimated is explained. Secondly, some investigation results of the method for producing weathering layers of man-made weathering rocks and homogeneity of produced weathering layers are reported. Lastly, a new method for estimating weathering thickness of man-made weathering rocks nondestructively, simply and quantitatively is suggested by using rebound hardness of man-made weathering rocks, weathering layers and nonweathering layers, respectively.

Estimation of weathering thickness of man-made weathering rocks with the Equotip hardness tester
Kawasaki, S, Cho, SH, Kaneko, K
Journal of Japan Society of Engineering Geology, 48, 4, 162, 169, Japan Society of Engineering Geology, 2007, [Peer-reviewed]
Japanese, Scientific journal, In general, rocks are oxidized and weathered when they are exposed to the surface of the earth by natural erosions or man-made excavations. As a consequence, the strength of rocks that suffered such weathering decreases in the end. Provided that a new method which can estimate weathering thickness of rocks nondestructively, simply and quantitatively in the fields is developed, it is expected that the method is useful for the practical fields such as engineering geology, geotechnical engineering and so forth. In order to develop a new estimation method for weathering thickness of rocks like boring cores or relatively shallow weathering layers of outcropping rock masses, the authors produced four kinds of man-made weathering rocks modeled on natural weathering rocks. Then a series of Equotip rebound hardness tests was conducted by using man-made weathering rocks. Furthermore, an experimental investigation was carried out by taking notice of especially weathering thickness of man-made weathering rocks and the ratio of weathering layers to nonweathering layers in rebound hardness. In this paper, firstly the man-made weathering rock model by which weathering thickness of weathering rocks and shallow weathering layers of rock masses can be estimated is explained. Secondly, some investigation results of the method for producing weathering layers of man-made weathering rocks and homogeneity of produced weathering layers are reported. Lastly, a new method for estimating weathering thickness of man-made weathering rocks nondestructively, simply and quantitatively is suggested by using rebound hardness of man-made weathering rocks, weathering layers and nonweathering layers, respectively.

The influence of rock texture on argillaceous rock heaving: A case of Notoro argillaceous rock
Kashiwaya, K, Kawasaki, S, Kaneko, K, Yoneda, T
Journal of Japan Society of Engineering Geology, 48, 2, 97, 102, Japan Society of Engineering Geology, 2007, [Peer-reviewed]
Japanese, Scientific journal, To clarify factors causing uneven heaving on a cutting plane of Tertiary Miocene Notoro formation, mineralogy, chemistry, and rock texture were examined. Samples are four argillaceous rocks collected from the cores of noticeably or slightly heaving points. Results showed that the samples of the noticeably and slightly heaving points have similar mineral and chemical compositions, but their rock textures are different. The samples of the noticeably heaving point have coarser granular variations than those of the slightly heaving point, and the matrix of the former was more widely impregnated with fluorescent resin than it of the latter. When it is assumed that the heaving occurred from the influence of water, the uneven heaving may result from difference in void structures which developed closely correlating with the granular variations.

Fundamental study on novel grout cementing due to microbial metabolism
Kawasaki, S, Murao, A, Hiroyoshi, N, Tsunekawa, M, Kaneko, K
Journal of Japan Society of Engineering Geology, 47, 1, 2, 12, Japan Society of Engineering Geology, 2006, [Peer-reviewed]
Japanese, Scientific journal, Natural soil contains approximately 10^7 to 10^9 microorganisms per gram. Considering this large number of microorganisms, it is expected that soil and rock engineering, especially the field of mechanics, may be able to develop a novel eco-friendly technology to improve the scalability of soil and rock. We performed fundamental laboratory tests in order to develop a novel conceptual grout, hereafter denoted as biogrout. Biogrout consists primarily of calcium carbonate, one of the typical cement elements in soil and rock. This compound can fill the voids and cracks in soil and rock using microbial metabolism. We performed separation tests on calcium carbonate in test tubes, examining the effects of several test conditions, including temperature, organic nutrition, and different buffering conditions, on the separation of calcium carbonate when challenged with commercially available dry yeast and microorganisms naturally living in soil. Furthermore, we examined the improvements in the sealability of sand and clay following biogrout improvement, confirming that coefficients of permeability of both soil types decreased by approximately one order of magnitude from those seen for normal soils. Although a number of problems will need to be addressed, these test results indicate that biogrout is a promising candidate to improve ground properties. The development of such a compound has been successful using microbial metabolism.

微生物代謝により固化する新しいグラウトに関する基礎的検討　　　　　　　　　　　　　　　
村尾彰了, 川﨑了, 広吉直樹, 恒川昌美, 金子勝比古
第34回岩盤力学に関するシンポジウム講演論文集, 417, 422, 2005
Japanese, Symposium

Effect of water content on optical and mechanical properties of rocks
F Shiraki, S Kawasaki, K Kaneko
Contribution of Rock Mechanics to the New Century, Vols 1 and 2, 899, 902, 2004
English, International conference proceedings

乾燥による岩石の物理的性質の変化に関する室内試験　　　　　　　　　　　　　　　
白木文香, 川﨑了, 金子勝比古
第33回岩盤力学に関するシンポジウム講演論文集, 283, 288, 2004
Japanese, Symposium

Estimation method for weathering thickness of man-made weathering rocks by using the Equotip hardness tester　　　　　　　　　　　　　　　
Kawasaki, S, Kaneko, K
Proceedings of the ISRM Regional Symposium EUROCK 2004 and 53rd Geomechanics Colloquy, 491, 494, 2004
English, International conference proceedings

Influence of the rock mass inhomogeneity caused by layer geometry on the regional stress field　　　　　　　　　　　　　　　
Cho, S.H, Nakamura, K, Kawasaki, S, Yang, H.S, Sato, M, Nakama, S, Kaneko, K
Tunnel and Underground Space, Journal of Korean Society for Rock Mechanics, 14, 2, 142, 153, 2004, [Peer-reviewed]
English, Scientific journal

Effect of Water Content on Color and Physical Properties of Rocks
Kawasaki Satoru, Shiraki Fumika, Kaneko Katsuhiko
Proceedings of the Japan National Conference on Geotechnical Engineering, 39, 561, 562, The Japanese Geotechnical Society, 2004
Generally, physical properties of rocks are affected by changes of water content, and it is well known that the effect of water content of soft rocks, which have relatively large void ratios, is still larger than that of hard rocks. In order to investigate the effect of water content on physical properties of rocks, color and several physical properties of rocks were measured under the water-saturated and dry conditions. As a conclusion, it is expected that there is a possibility that P-wave velocity and rebound hardness of rocks may be able to estimate by using brightness difference of rocks.

分光測色計を用いた鉱物および岩石の色測定　　　　　　　　　　　　　　　
千引春菜, 川﨑了, 金子勝比古
第32回岩盤力学に関するシンポジウム講演論文集, 323, 328, 2003
Japanese, Symposium

Estimation of regional stress and stress distribution
S Kawasaki, K Nakamura, T Sato, S Nakama, K Kaneko
ROCK STRESS, 419, 424, 2003
English, International conference proceedings

人工風化岩を用いた簡易反発硬度試験　　　　　　　　　　　　　　　
阿部右吾, 川﨑了, 金子勝比古
第32回岩盤力学に関するシンポジウム講演論文集, 329, 334, 2003
Japanese, Symposium

Evaluation of rock mass elastic constants by using earthmover load
S Kawasaki, K Kaneko, Y Obara, N Nakamura, R Tsukayama
FIELD MEASUREMENTS IN GEOMECHANICS, 513, 518, 2003
English, International conference proceedings

Shear characteristics of rock joints under constant dilatancy
Tanimoto, C, Suzuki, J, Kawasaki, S, Nakahara, T
Journal of Geotechnical Engineering, Japan Society of Civil Engineers, 2003, 736, 93, 102, Japan Society of Civil Engineers, 2003, [Peer-reviewed]
Japanese, Scientific journal, In consideration of allowable limit of displacement and deformation associated with rock tunnelling, we should pay more attention to the meaning of the shear behavior of rock joints under constant dilatancy. By employing about 250 specimens which were made of three materials and reproduced from several natural joints with different roughnesses, the authors have carried out direct shear tests under constant dilatancies. The breakage of joint asperity was discussed from the point of view standing on the relationship between shear strength and the loss of asperity. The method to estimate the volume of fractured asperities was proposed and the correlation between shear strength and the volume was discussed. Finally, the authors proposed the new relational expression between the volume of fractured asperities and the shear strength.

Shear Strength of Rock Joint under Constant Pressured and Constant Dilatancy.
TANIMOTO Chikaosa, KITAMURA Yoshinori, KAWASAKI Satoru, MIYATA Kenjiro, SUZUKI Junya
Doboku Gakkai Ronbunshu, 2002, 715, 83, 94, Japan Society of Civil Engineers, 2002, [Peer-reviewed]
Japanese, Scientific journal, The shear strength of a rock joint has been focussed by many engineers over several decades. So far as the authors know, there are many publications concerning the shear test under constant normal load and/or stiffness. In consideration of allowable limit of displacement/deformation associated with rock tunnelling, we should pay more attention to the meaning of the shear behavior of rock joints under constant dilatancy than the one under constant normal load and stiffness, which is much far from the reality in rock tunneling with loosening phenomenon. By employing more than 140 specimens which were reproduced from 20 natural joints with different roughnesses, the authors have carried out direct shear tests under both constant pressures and dilatancies.
The breakage of joint asperity was discussed from the point of view standing on the relationship between the loss of asperity and mobilized shear strength. The change of shear strength from the peak to the residual strength has been clarified and the appropriate installation of supporting elements in rock tunnelling was discussed.

Shear strength and propagation of seismic wave during rock joint shear test under constant pressure and constant dilatancy
Tanimoto, C, Miyata, K, Kawasaki, S, Kitamura, Y, Suzuki, J
Journal of Geotechnical Engineering, Japan Society of Civil Engineers, 2002, 715, 95, 105, Japan Society of Civil Engineers, 2002, [Peer-reviewed]
Japanese, Scientific journal, Through the long term running research conducted by the prime author, it has been clarified that, when seismic wave propagated through rock joints, the change of amplitude showed more sensitive than that of propagating velocity. Basing on this observation, the authors carried out the measurement of the velocity and amplitude of propagating wave during the rock joint shear test. It was confirmed that the monitoring by means of the change of amplitude of propagating wave could show the progress of loosening during excavation. The final objective of the research is to estimate the magnitude of loosening phenomenon in quantitative manner which is essential in rock tunneling.

An attempt to estimate mechanical properties of rocks using the Equotip hardness tester
Kawasaki, S, Tanimoto, C, Koizumi, K, Ishikawa, M
Journal of Japan Society of Engineering Geology, 43, 4, 244, 248, Japan Society of Engineering Geology, 2002, [Peer-reviewed]
Japanese, Scientific journal, The Equotip hardness tests, unconfined compression tests and elastic wave tests were conducted using rock cores sampled from several sites in Japan, and a consideration of correlations between obtained hardness indexes and mechanical properties was carried out. As a result, it was found that there was a fair possibility of estimating the values of unconfined compressive strength using hardness indexes.

The development of property evaluation method for rock materials based on the simple rebound hardness test: Investigations on the effects of test conditions and fundamental properties
S Kawasaki, M Yoshida, C Tanimoto, T Masuya
ROCK MECHANICS: A CHALLENGE FOR SOCIETY, 103, 108, 2001
English, International conference proceedings

風化岩を対象とした簡易反発硬度試験の適用性　　　　　　　　　　　　　　　
吉田昌登, 川﨑了, 谷本親伯, 舛屋直
第31回岩盤力学に関するシンポジウム講演論文集, 97, 101, 2001
Japanese, Symposium

Deterioration phenomena and conservation methods of stone Buddha images in Japan
S Kawasaki, C Tanimoto
FRONTIERS OF ROCK MECHANICS AND SUSTAINABLE DEVELOPMENT IN THE 21ST CENTURY, 413, 416, 2001
English, International conference proceedings

エコーチップ反発硬度試験の岩石材料への適用性　　　　　　　　　　　　　　　
吉田昌登, 川﨑了, 谷本親伯, 舛屋直
第30回岩盤力学に関するシンポジウム講演論文集, 308, 312, 2000
Japanese, Symposium

The development of property evaluation method for rock materials based on the simple rebound hardness test: Investigations on the effects of test conditions and fundamental properties
Kawasaki, S, Yoshida, M, Tanimoto, C, Masuya, T
Journal of Japan Society of Engineering Geology, 41, 4, 230, 241, Japan Society of Engineering Geology, 2000, [Peer-reviewed]
Japanese, Scientific journal, The Equotip hardness tester made in Switzerland is one of the testers developed so as to understand elastic properties and strengths of metallic materials. It is picked up as the characteristics of the tester that a small sample is needed for the test, sampling time is short, and the tester is convenient for portable use. In case of applying the tester to an actual rock structure and a lithic cultural heritage whose shape is complex, it is therfore expected that the tester is able to measure rapidly toward all test directions in the fied. For the purpose of newly developing an evaluation method for rock materials using the tester, this paper reports on especially two objects such ad (1)investigations on the effects of test conditions(considerations on the size, shape and roughness of rock samples), and (2)investigations on fundamental properties of unweathered rock samples(considerations on the relationships to physical and mechanical properties).

不連続性岩盤の弾性波伝播特性に関する検討
宮田健治朗, 谷本親伯, 川﨑了, 舛屋直
第30回岩盤力学に関するシンポジウム講演論文集, 178, 182, 2000
Japanese, Symposium

室内試験による岩石の比抵抗に関する基礎的研究　　　　　　　　　　　　　　　
西澤亮総, 谷本親伯, 川﨑了, 舛屋直
第30回岩盤力学に関するシンポジウム講演論文集, 188, 192, 2000
Japanese, Symposium

岩盤不連続面の表面形状の定量化とせん断強度の推定に関する研究　　　　　　　　　　　　　　　
北村義宜, 谷本親伯, 川﨑了, 舛屋直
第30回岩盤力学に関するシンポジウム講演論文集, 348, 352, 2000
Japanese, Symposium

二種混合体の圧縮特性に関する解析的検討－礫岩の強度評価へのアプローチ－　　　　　　　　　　　　　　　
中本崇, 西村強, 川﨑了, 木山英郎
第30回岩盤力学に関するシンポジウム講演論文集, 338, 342, 2000
Japanese, Symposium

Quality evaluation of deep conglomerate core samples based on laboratory tests
Kawasaki, S, Nakagawa, K, Eto, Y, Nozaki, A, Koizumi, K
Journal of Geotechnical Engineering, Japan Society of Civil Engineers, 617, 617, 77, 87, Japan Society of Civil Engineers, 1999, [Peer-reviewed]
Japanese, Scientific journal, In case of constructing underground structures in deep conglomerate, it is considered that strength and deformation properties of conglomerate core samples are occasionally overestimated because of gravel effect, while the properties are underestimated because of sample disturbance by core sampling. A series of laboratory tests was therefore performed using deep conglomerate core samples and the quality evaluation of the samples was conducted. In this paper, it is presented that the sample disturbance which gives influences to the quality of the samples is complicatedly concerned with gravel fraction content and calcite content. Especially the smaller the calcite content and the gravel fraction content are, the more extensively the sample disturbance is influenced.

Quality evaluation of conglomerate core samples based on laboratory tests
S Kawasaki, H Ito, K Nakagawa, Y Eto, A Nozaki, K Koizumi
NINTH INTERNATIONAL CONGRESS ON ROCK MECHANICS, VOLS 1 & 2, 619, 622, 1999
English, International conference proceedings

Measurement method of gravel fraction content of conglomerate by image data processing
Kawasaki, S, Koizumi, K
Journal of Japan Society of Engineering Geology, 39, 2, 202, 207, 1998, [Peer-reviewed]
Japanese, Scientific journal

Evaluation on scale effect of conglomerate core sample and disturbance by core sampling
Kawasaki, S, Ito, Y, Koizumi, K
Journal of Japan Society of Engineering Geology,, 39, 4, 391, 400, 1998, [Peer-reviewed]
Japanese, Scientific journal

大深度堆積礫岩の力学特性－室内試験による礫岩コアの品質評価－
川﨑了, 中川加明一郎, 江藤芳武, 野崎明人, 小泉和広
第10回岩の力学国内シンポジウム講演論文集, 797, 802, 1998
Japanese, International conference proceedings

An attempt to estimate coefficient of permeability by taking notice of consolidation phenomenon on sedimentary rock
Kawasaki, S, Nakagawa, K, Koizumi, K
Journal of Japan Society of Engineering Geology, 39, 3, 273, 281, Japan Society of Engineering Geology, 1998, [Peer-reviewed]
Japanese, Scientific journal, From the viewpoint that the principle of effective stress can apply to rocks, an attempt to estimate coefficients of permeability of rocks was performed by measuring of consolidation phenomenon like soil materials. Specimens were sedimentary rocks, i.e., soft mudstone and hard conglomerate. This attempt led to the conclusion that close agreement between coefficients of permeability measured by isotropic consolidation tests and injection tests was seen. It is a special merit of this estimation method for coefficient of permeability that a triaxial test with a consolidation test is enough to obtain coefficient of permeability without a laboratory permeability test. This simple estimation method is therefore considered one of effective methods.

Investigation on mechanical properties of sedimentary ground at great depth in consideration of consolidation history
Kawasaki, S, Nishi, K, Okamoto, T
Journal of Geotechnical Engineering, Japan Society of Civil Engineers, 589, 589, 79, 90, 土木学会, 1998, [Peer-reviewed]
Japanese, Scientific journal

軟岩地盤での圧縮空気貯槽建設コストのパラメトリックスタディ　　　　　　　　　　　　　　　
川﨑了, 岡本敏郎, 田中幸久
地下空間シンポジウム論文・報告集, 2, 175, 179, 1997
Japanese, Symposium

Feasibility of compressed air energy storage in deep soft rock ground - Application of the slurry excavation and steel pipe shaft method
S Kawasaki, T Okamoto, Y Tanaka, S Hibino
TUNNELS FOR PEOPLE, VOLS 1 AND 2, 835, 840, 1997
English, International conference proceedings

Measurement of pore pressure distribution in deep rock and its application to estimating underground water flow　　　　　　　　　　　　　　　
Nakagawa, K, Kawasaki, S, Shidahara, T, Eto, Y, Nozaki, A
Proceedings of the International Symposium on Rock Mechanics and Environmental Geotechnology, 477, 481, 1997
English, International conference proceedings

An attempt of property classification of deep sedimentary conglomerate by using core samples
Kawasaki, S, Nakagawa, K, Eto, Y, Nozaki, A, Koizumi, K
Journal of Japan Society of Engineering Geology, 38, 5, 296, 298, 1997, [Peer-reviewed]
Japanese, Scientific journal

Consideration of deep sedimentary conglomerate properties by taking notice of the calcite content
Kawasaki, S, Nakagawa, K, Eto, Y, Nozaki, A, Koizumi, K
Journal of Japan Society of Engineering Geology, 38, 5, 252, 264, Japan Society of Engineering Geology, 1997, [Peer-reviewed]
Japanese, Scientific journal, To investigate deep conglomerate properties, a deep boring of the depth of 600 m and a series of laboratory rock tests were performed. And we especially took notice of the calcite content considered a large influence on mechanical properties of conglomerate. A quantity measuring of the calcite content was tried to research relationships between the calcite content and mechanical properties of conglomerate. These results led to the conclusion that it was clear that laboratory test results of deep sedimentary conglomerate were able to be evaluated by considering t, he calcite content and the influence of looseness by stress release on conglomerate core samples.

大深度軟岩地盤における立坑掘削挙動を模擬した室内模型実験　　　　　　　　　　　　　　　
川﨑了, 岡本敏郎, 田中幸久
第27回岩盤力学に関するシンポジウム講演論文集, 111, 115, 1996
Japanese, Symposium

Feasibility and characteristics of Compressed Air Energy Storage-Gas Turbine generation in soft rock ground: Application of muddy slurry excavation and steel pipe shaft construction method in great depth
Okamoto, T, Tanaka, Y, Kawasaki, S, Hibino, S
Journal of Japan Society of Engineering Geology, 35, 6, 264, 272, Japan Society of Engineering Geology, 1995, [Peer-reviewed]
Japanese, Scientific journal, Geological conditions should be considered when a storage cavern is constructed in rock ground for compressed air energy storage gas turbine generator which is hopeful as electric power storage in near future, and muddy slurry excavation and steel pipe shaft method is proposed in soft rocks. The water replacement type and dry type are typical in the method and their basic characteristics are studied in this paper. Most important things in realizing this method are both feasibility of excavating a cavern and its economic advantage, especially present evaluation of cavern stability in muddy slurry excavation and economically optimum depth in positioning a cavern are studied in this paper.

定ひずみ速度圧密試験法の堆積軟岩への適用　　　　　　　　　　　　　　　
川﨑了, 西好一, 高橋浩
第25回岩盤力学に関するシンポジウム講演論文集, 126, 130, 1993
Japanese, Symposium

MECHANICAL-PROPERTIES OF DEEP SOFT ROCK GROUND IN THE SUBURBS OF TOKYO
S KAWASAKI, K NISHI, Y FUJIWARA
GEOTECHNICAL ENGINEERING OF HARD SOILS - SOFT ROCKS, VOL 1, 593, 600, 1993
English, International conference proceedings

Construction technology of compressed air storage tank in soft rock ground for CAES-GT generation　　　　　　　　　　　　　　　
Nishi, K, Kawasaki, S, Fujiwara, Y, Hibino, S
Proceedings of the 2nd International Compressed Air Energy Storage Conference, 1, 16, 1992
English, International conference proceedings

Other Activities and Achievements

マイクロフォーカスX線CTを用いた地下圏バイオメタン生成に関する褐炭の微細構造変化の観察
田中翔, 福田大祐, 川崎了, 荒牧憲隆, 金子勝比古, 資源・素材(Web), 2015, 2015

函館市豊崎町における落石メカニズム解明を目的とした長期モニタリング対象の旧道岩盤斜面を構成する岩石の特徴
冨樫晃平, 小玉齊明, 山真典, 菅原隆之, 畠山葵, 福田大祐, 加藤昌治, 川崎了, 藤井義明, 資源・素材学会春季大会(Web), 2014, 2014

Aging behaviour of organic matter decomposition and microstructure of coal in hydrogen peroxide solution
荒牧憲隆, 玉村修司, 田中翔, 清水了, 上野晃生, 川崎了, 金子勝比古, 地盤工学シンポジウム論文集地盤工学会編, 59, 539, 546, 2014
地盤工学会, Japanese

New Soil Improvement Technology Merged with Biological and Chemical Engineering : New Challenges for the High Organic Soil Like Peat
畠俊郎, 佐藤厚子, 川崎了, 阿部廣史, 地盤工学会誌, 62, 1, 32, 33, 2014
地盤工学会, Japanese

11. Sand solidification test using ureolytic bacteria, Pararhodobacter sp.
Danjo Takashi, Kawasaki Satoru, Shimazaki Suguru, Koizuka Keisuku, 研究発表会講演論文集, 26, 21, 22, 2014
日本応用地質学会, Japanese

地盤工学会論文賞(和文部門)を受賞して
稲垣由紀子, 塚本将康, 森啓年, 中島進, 佐々木哲也, 川崎了, 地盤工学会誌 = / the Japanese Geotechnical Society, 60, 8, 38, 38, 01 Aug. 2012
地盤工学会, Japanese

X-ray Computed Tomography Image Segmentation of Three Phase Composites Considering Partial Volume Effect
KATO Masaji, YAMANAKA Hiroshi, TAKAHASHI Manabu, KAWASAKI Satoru, KANEKO Katsuhiko, 情報地質 = Geological data processing, 23, 2, 78, 79, 15 Jun. 2012
Japanese

P25. Understanding Formation Mechanisms of Beachrocks
Danjo Takashi, Kawasaki Satoru, Hata Toshiro, 研究発表会講演論文集, 24, 189, 190, 2012
日本応用地質学会, Japanese

マイクロフォーカスX線CTによる二相構造画像の二値化に関する基礎的検討
山中裕史, 川崎了, 加藤昌治, 金子勝比古, 資源・素材学会北海道支部春季講演会講演要旨集, 2010, 15, 16, 2010
Japanese

Extraction of Porosity Change of Geomaterials Using X-ray CT Images
KATO Masaji, KOBAYASHI Yuya, KAWASAKI Satoru, KANEKO Katsuhiko, 情報地質 = Geological data processing, 20, 2, 112, 113, 18 Jun. 2009
Japanese

X線CT法を用いたバイオグラウト処理された供試体内部の定量化の試み
小林優矢, 川崎了, 加藤昌治, 金子勝比古, 椋木俊文, 資源・素材学会北海道支部春季講演会講演要旨集, 2009, 13, 14, 2009
Japanese

X線CT法を用いたバイオグラウト処理された供試体内部の評価
小林優矢, 川崎了, 加藤昌治, 金子勝比古, 椋木俊文, 資源・素材, 2009, 12, 2009
Japanese

メタ珪酸ナトリウムを用いたバイオグラウト
小林元, 川崎了, 広吉直樹, 恒川昌美, 金子勝比古, 島田俊介, 春季大会講演集. I, 資源編, 19, 2, 73, 74, 29 Mar. 2007
Japanese

静水圧条件と三軸圧縮条件における堆積岩の変形挙動と間隙水の排水挙動との関係
上野悠也, 加藤昌治, 高橋学, 川崎了, 金子勝比古, 春季大会講演集. I, 資源編, 19, 1, 37, 38, 29 Mar. 2007
Japanese

P42. Fundamental study on biogrout using sodium metasilicate
KOBAYASHI Gen, KAWASAKI Satoru, HIROYOSHI Naoki, TSUNEKAWA Masami, KANEKO Katsuhiko, TERAJIMA Rei, SHIMADA Shunsuke, 研究発表会講演論文集, 19, 229, 230, 2007
日本応用地質学会, Japanese

研究室紹介北海道大学大学院工学研究科環境フィールド工学専攻大気地圏環境工学講座地圏フィールド工学研究室
金子勝比古, 川崎了, 石灰石, 338, 21, 29, Nov. 2005
石灰石鉱業協会, Japanese

63. Soil Improvement Tests on Sealability Using Biogrout
Kawasaki Satoru, Murao Akira, Hiroyoshi Naoki, Tsunekawa Masami, Kaneko Katsuhiko, 研究発表会講演論文集, 17, 221, 222, 2005
日本応用地質学会, Japanese

P17. Estimation of Physical Properties of Rocks Using Brightness Difference
Kawasaki Satoru, Shiraki Fumika, Kaneko Katsuhiko, 研究発表会講演論文集, 17, 329, 330, 2005
日本応用地質学会, Japanese

乾燥による岩石の物理的性質の変化
川崎了, 白木文香, 金子勝比古, 春季大会講演集. I, 資源編, 16, 1, "企画, 174"-"企画-175", 29 Mar. 2004
Japanese

地盤内三次元応力分布の評価法
栗栖圭太郎, 中村圭太, 川崎了, 金子勝比古, 佐藤稔紀, 中間茂雄, 春季大会講演集. I, 資源編, 16, 1, 13, 14, 29 Mar. 2004
Japanese

三次元広域応力場の解析手法に関する研究
中村圭太, 川崎了, 金子勝比古, 佐藤稔紀, 中間茂雄, 春季大会講演集. I, 資源編, 15, 1, 189, 190, 27 Mar. 2003
Japanese

エコーチップ硬さ試験機による岩石の一軸圧縮強度の推定
川崎了, 土木学会年次学術講演会講演概要集第3部, 2002, 57, 887, 888, 2002

40275 Extraction of bamboo species in southern areas of Kyoto prefecture using satellite data.
KOIZUMI Keigo, TANIMOTO Tikaosa, KAWASAKI Satoru, PIAO Chunze, AZUMADA Kensuke, OHASHI Naohiro, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. D-1, Environmental engineering I, Room acoustics and acoustic environment noise and solidborne sound environmental vibration light and color water supply and drainage water environment urban installation and environmental management environmental psychology and physiology environmental design electro-magnetic environment, 2001, 567, 568, 31 Jul. 2001
Architectural Institute of Japan, Japanese

「圧密履歴を考慮した大深度堆積地盤の力学的特性に関する考察」への討議・回答
龍岡文夫, 川崎了, 西好一, 岡本敏郎, 土木学会論文集 = Proceedings of JSCE, 624, 293, 297, 21 Jun. 1999
土木学会, Japanese

Granular Assembly Simulation for Compression Strength of Mixed Circular Elements Using DEM
Nakamoto Takashi, Kawasaki Satoru, Kiyama Hideo, Fujimura Hisashi, Nishimura Tsuyoshi, Reports of the Faculty of Engineering, Tottori University, 29, 1, 119, 124, Nov. 1998
Tottori University, Japanese

定ひずみ速度圧密試験法の堆積軟岩への適用
川崎了, 第27回土質工学研究発表会, 1231, 1232, 1992

Distinct Element Analysis of Fractured Rock Mass with the Auto Element Tessellation
木山英郎, 藤村尚, 西村強, 川崎了, Reports of the Faculty of Engineering,Tottori University, 18, 1, p121, 127, Nov. 1987
鳥取大学工学部, Japanese

Books and other publications

Organic-Inorganic Hybrid Green Materials for Soil Improvement. In: Chinnappan Baskar, Seeram Ramakrishna, Angela Daniela La Rosa (eds.) Encyclopedia of Green Materials　　　　　　　　　　　　　　　
Thiloththama Hiranya Kumari Nawarathna, Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Springer Nature Singapore, Jan. 2022, 9789811649219

Stabilization/solidification of mining waste via biocementation. In: Daniel C.W. Tsang, Lei Wang (eds) Low Carbon Stabilization and Solidification of Hazardous Wastes　　　　　　　　　　　　　　　
Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki
Elsevier, Netherlands, Sep. 2021

Biocementation technology for stabilization/solidification of organic peat. In: Daniel C.W. Tsang, Lei Wang (eds.) Low Carbon Stabilization and Solidification of Hazardous Wastes　　　　　　　　　　　　　　　
Sivakumar Gowthaman, Meiqi Chen, Kazunori Nakashima, Shin Komatsu, Satoru Kawasaki
Elsevier, Netherlands, Sep. 2021

The Amendments in Typical Microbial Induced Soil Stabilization by Low-Grade Chemicals, Biopolymers and Other Additives: A Review. In: V. Achal and C. S. Chin (eds.) Building Materials for Sustainable and Ecological Environment　　　　　　　　　　　　　　　
Sivakumar Gowthaman, Thiloththama Hiranya Kumari Nawarathna, Pahala Ge Nishadi Nayanthara, Kazunori Nakashima, Satoru Kawasaki
Springer, Singapore, May 2021

地盤材料試験の方法と解説（第一回改訂版）　　　　　　　　　　　　　　　
地盤工学会, Dec. 2020

Effect of Plant-Derived Urease-Induced Carbonate Formation on the Strength Enhancement of Sandy Soil. In: Achal V., Mukherjee A. (eds) Ecological Wisdom Inspired Restoration Engineering　　　　　　　　　　　　　　　
Dilrukshi R.A.N, Kawasaki S
Springer, Singapore, Aug. 2018

Utilization of Microbially Induced Calcite Precipitation for Sand Solidification Using Pararhodobacter sp.. In: Achal V., Mukherjee A. (eds) Ecological Wisdom Inspired Restoration Engineering　　　　　　　　　　　　　　　
Amarakoon G.G.N.N, Kawasaki S
Springer, Singapore, Aug. 2018

Making Artificial Beachrock Through Bio-cementation: A Novel Technology to Inhibition of Coastal Erosion. In: Hussain C. (eds) Handbook of Environmental Materials Management　　　　　　　　　　　　　　　
Khan M.N.H, Kawasaki S
Springer, Cham, Jan. 2018

地盤材料試験の方法と解説　　　　　　　　　　　　　　　
地盤工学会, 2009

岩の試験・調査方法の基準・解説書－平成18年度版－　　　　　　　　　　　　　　　
地盤工学会, 2006

『残壁ハンドブック』<資源・素材学会残壁ハンドブック編集委員会>　　　　　　　　　　　　　　　
資源・素材学会, 2005

岩の試験・調査方法の基準・解説書－平成14年度版－　　　　　　　　　　　　　　　
地盤工学会, 2003

『ロックメカニクス』<日本材料学会編>　　　　　　　　　　　　　　　
技報堂出版, 2002

Courses

開発システム工学特論　　　　　　　　　　　　　　　
北海道大学大学院工学研究科

岩石力学実験　　　　　　　　　　　　　　　
北海道大学工学部

Geotechnical Measurement Engineering　　　　　　　　　　　　　　　
北海道大学大学院工学院，工学研究科

地圏計測工学特論　　　　　　　　　　　　　　　
北海道大学大学院工学院，工学研究科

土の力学Ⅱ　　　　　　　　　　　　　　　
北海道大学工学部

資源循環システム実験Ⅲ　　　　　　　　　　　　　　　
北海道大学工学部

資源循環システム実験Ⅱ　　　　　　　　　　　　　　　
北海道大学工学部

情報学Ⅰ　　　　　　　　　　　　　　　
北海道大学

一般教育演習　　　　　　　　　　　　　　　
北海道大学

計測工学実験　　　　　　　　　　　　　　　
北海道大学工学部

熱力学演習　　　　　　　　　　　　　　　
北海道大学工学部

熱力学　　　　　　　　　　　　　　　
北海道大学工学部

計測工学　　　　　　　　　　　　　　　
北海道大学工学部

Environmental Microbiology　　　　　　　　　　　　　　　
School of Engineering, Hokkaido University

地殻システム工学　　　　　　　　　　　　　　　
北海道大学工学部

Geomechanics　　　　　　　　　　　　　　　
北海道大学大学院工学院

Affiliated academic society

THE SOCIETY FOR BIOTECHNOLOGY, JAPAN

Japan Geoscience Union

Japanese Society for Engineering Education

Japan Society of Engineering Geology

Japan Society of Civil Engineers

The Mining and Materials Orocessing Institute of Japan

Japanese Society for Rock Mechanics

International Society for Soil Mechanics and Geotechnical Engineering

International Society for Rock Mechanics

The Japanese Geotechnical Society

Research Themes

空中浮遊菌を用いたフミン酸が地盤材料のバイオセメンテーションに与える影響
科学研究費助成事業
Apr. 2025 - Mar. 2028
川崎了
日本学術振興会, 基盤研究(B), 北海道大学, Principal investigator, 25K01318

Elucidation of the Relationship Between Time-Dependence of Rock Failure and Microbial Weathering Dynamics
Grants-in-Aid for Scientific Research
01 Apr. 2024 - 31 Mar. 2027
松原仁, 川崎了, 伊東孝
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), University of the Ryukyus, 24K00981

Eco-friendly biocementation of geomaterials using acid urease and bone meal
Grants-in-Aid for Scientific Research
01 Apr. 2022 - 31 Mar. 2025
川崎了
2年目となる令和5年度は，①微生物由来の酸性ウレアーゼの探索，②培養試験およびリン酸カルシウム化合物（CPC）室内析出試験，③小型容器を用いた地盤材料の室内固化試験，を実施した。その結果，得られた主な成果の概要は，次のとおりである。
①微生物由来の酸性ウレアーゼの探索：単離源として植物や動物を対象とし，ウレアーゼを有する乳酸菌の単離試験を異なる培養条件下で実施した。その結果，好気条件よりも嫌気条件の方が多くの乳酸菌を単離することができたが，いずれもウレアーゼ活性が非常に低いことがわかった。一方，製品評価技術基盤機構（NITE）のNBRC（NITE Biological Resource Center）から購入した乳酸菌3株のウレアーゼ活性を調べた結果，高いウレアーゼ活性を有する乳酸菌が1株あることがわかった。また，同菌株のウレアーゼ活性のpH依存性について調査した結果，pH3～4の酸性領域で高いウレアーゼ活性を示した。
②培養試験およびリン酸カルシウム化合物（CPC）室内析出試験：前記した乳酸菌株を用いた温度25～37℃の培養試験では，温度が菌体濃度に及ぼす影響は小さく，いずれも24時間後の菌体濃度が最大となる。ウレアーゼ活性については，温度が高いほど活性が高くなった。遠沈管を用いたCPC析出試験に関しては，CPC源として食品廃棄物である動物（牛と豚）の骨粉とマグロの骨が使用可能であること，析出した結晶の鉱物名はBrushiteであること，などがわかった。
③小型容器を用いた地盤材料の室内固化試験：骨粉およびマグロの骨をCPC源とし，シリンジを用いた砂質地盤材料の室内固化試験を実施した。その結果，固化した供試体の針貫入試験によって得られた推定一軸圧縮強さ（推定UCS）は，温度37℃で試験期間7日の場合に供試体の上，中，下部において，それぞれ37MPa，34MPa，8MPaとなった。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23K22851

Eco-friendly biocementation of geomaterials using acid urease and bone meal
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Apr. 2022 - Mar. 2025
Satoru Kawasaki
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, 22H01581

天然および人工の有機・無機接着界面から発想する新たなバイオベース固化技術の創出
科学研究費助成事業
01 Apr. 2021 - 31 Mar. 2024
中島一紀, 川崎了, 五十嵐健輔
日本学術振興会, 基盤研究(B), 北海道大学, 21H03627

Development of biocementation technology for self-healing with selective and concentrative function
Grants-in-Aid for Scientific Research
01 Apr. 2021 - 31 Mar. 2024
松原仁, 川崎了, 椋木俊文
脆弱化した岩石の自己組織的な新しい修復技術の構築に向けて，フィールド調査，室内実験，X線画像解析，シミュレーションの観点からの研究を進めており，2021年度の活動は以下のようにまとめることができる。
(1)上期に沖縄本島・離島および北海道にて事前の露頭調査を実施し，詳細調査の対象とする砂岩および凝灰岩露頭を選定した。そして，夏期および冬期には，沖縄本島・離島で選定した露頭の詳細調査を実施し，環境因子（気温，湿度，光量子密度），マクロ強度，鉱物組成（XRD），分子質量数（MS，ICP発光分析），微細構造（SEM），岩内微生物の菌叢構造（NGS）を得た。
(2)セルロース繊維材としてバイオ炭（炭化木材，炭化バガス）を選定し，地盤固化を可能とするSporosarcina pasteuriiの活性化実験を実施した。結果として，改良の余地は多く残されているものの，活性化できる可能性を見出した。また，微弱電流の添加については，通電のみでも脆弱化した岩石を修復できる可能性を見出した。微生物なしの予備実験を実施したところ，多孔質岩の空隙部に炭酸塩が析出し，岩石の強度を高めることが明らかとなった。
(3)硅砂5号をSporosarcina pasteuriiおよび沖縄県内から採取した尿素分解菌を使って固化させた供試体を製作しした。そして，ナノX線CTスキャナーで撮影することにより，砂粒子と炭酸カルシウムの3次元構造を個別に得ることに成功した。
(4)MICP（microbially induced carbonate precipitation）のプロセスにおいて，微生物代謝および挙動，炭酸塩の析出，土粒子・間隙水の電場を考慮したマルチフィジックス・マルチスケール解析法を構築した。シミュレーションにて得られた炭酸塩の析出パターンは実験値に酷似し，析出量も実験と同等の値となることを確認した。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), University of the Ryukyus, 21H01428

Development of new slope protection technologies using biocementation by focusing on locality
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Apr. 2019 - Mar. 2022
Satoru Kawasaki
This study aimed to develop a new slope protection method of CaCO3 precipitation to solidify the surface soil of a slope, and to confirm the effectiveness of this method by focusing on the regional characteristics of microorganisms inhabiting the soil around the application site of the slope protection works.
A bacterial strain suitable for CaCO3 precipitation was identified in the surface soil of a slope in Hokkaido, Japan through screening for ureolytic bacteria suitable for biocementation in cold regions. The CaCO3 precipitation characteristics of this bacterial strain were investigated, and laboratory solidification tests using syringes and slope models were conducted using geomaterials with different particle size distributions. Furthermore, a field trial was conducted on the surface soil of a slope in Hokkaido, Japan. In conclusion, the effectiveness of the newly developed method was confirmed.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, 19H02229

Consolidated bioremediation of heavy metal contamination using biocementation and biomass
Grants-in-Aid for Scientific Research
01 Apr. 2018 - 31 Mar. 2021
Kazunori Nakashima
The objective of this study is to develop a system that can immobilize soil contaminated with high concentration of heavy metals using bio-cement technique, and completely remove a trace amount of heavy-metal ions in water using heavy-metal-binding biomass. Precipitation of CaCO3 using urease-producing bacteria was successfully applied for solidification and immobilization of heavy metals in a model and actual contaminated soil samples. Furthermore, bio-cement combined with organic polymers was developed to increase the strength of biocemented sample. Novel heavy metal adsorbents based on protein and natural polymers were developed, and a continuous adsorption system was constructed.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 18H03395

Development of a new land restoration and conservation technology learned from beachrock formation mechanism
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Apr. 2016 - Mar. 2019
KAWASAKI SATORU
The purpose of this study was to develop man-made beachrocks cemented by precipitated CaCO3, which were produced by using natural coastal materials. This technique endowed the man-made beachrocks with an unconfined compressive strength (UCS) of approximately 20-30 MPa after approximately one month of curing. The technique was newly developed in this study and validated for its effectiveness.
A search for ureolytic bacteria that yield high urease activity was conducted in coastal areas in Japan. Several types of discovered bacteria that exhibited suitable properties for precipitating CaCO3 were isolated from soil samples in areas such as Okinawa prefecture and Hokkaido. Accelerated laboratory solidification tests on sand samples were performed using the bacteria. The results demonstrated that after three weeks, the samples yielded approximately 20 MPa of UCS as measured in needle penetration tests. In conclusion, the effectiveness of the newly developed technique was validated.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, 16H04404

自然に学ぶ新しい国土修復保全技術に関する基礎的研究　　　　　　　　　　　　　　　
2016年度研究助成（継続）
Apr. 2017 - Mar. 2018
川﨑了
鹿島学術振興財団, Principal investigator, Competitive research funding

現地の微生物を利用した新しい地盤固化技術の実証　　　　　　　　　　　　　　　
先進技術シーズ研究への研究助成「第1回イムラ・ジャパン賞」助成金
Apr. 2017 - Mar. 2018
川﨑了
イムラ・ジャパン株式会社, Principal investigator, Competitive research funding

Evaluation and designing of adsorption layer method for countermeasures against excavated rocks
Grants-in-Aid for Scientific Research
01 Apr. 2014 - 31 Mar. 2017
Igarashi Toshifumi, TAMOTO Shuichi
Column experiments consisting of covering soil, crushed rock containing arsenic, and bottom adsorption layers were conducted in the laboratory to understand the leaching and migration of arsenic in relation to changes in water content and oxygen concentration. The results showed that the arsenic leaching was affected by water content and oxygen concentration. In addition, arsenic retardation was found to consist of both conventional reversible and irreversible adsorptions. The irreversible one results from the precipitation of iron hydroxides in the columns. The similar results were obtained in the in situ column experiments. The Hydrous1-D model was revised by considering the relationships. The leaching and migration of arsenic was evaluated by the revised model using the obtained parameters. This model will be effective in designing the adsorption layer method.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 26289149

自然に学ぶ新しい国土修復保全技術に関する基礎的研究　　　　　　　　　　　　　　　
2015(平成27)年度研究助成
Apr. 2016 - Mar. 2017
川﨑了
鹿島学術振興財団, Principal investigator, Competitive research funding

現地の微生物を利用した国土の新しい自己修復保全技術の開発　　　　　　　　　　　　　　　
平成27年度研究開発・調査助成
Apr. 2016 - Mar. 2017
川﨑了
八洲環境技術振興財団, Principal investigator, Competitive research funding

自然のビーチロック形成メカニズムに学ぶ国土の自己修復保全に関する技術開発　　　　　　　　　　　　　　　
2015年度環境研究助成
Nov. 2015 - Oct. 2016
川﨑了
住友財団, Principal investigator, Competitive research funding

ビーチロックに学ぶ国土修復保全技術の開発　　　　　　　　　　　　　　　
積水化学自然に学ぶものづくり研究助成プログラム
Oct. 2015 - Sep. 2016
川﨑了
積水化学工業, Principal investigator, Competitive research funding

ビーチロックに学ぶ新しい国土修復保全技術の開発　　　　　　　　　　　　　　　
平成27年度研究助成
Jul. 2015 - Mar. 2016
川﨑了
戸田育英財団, Principal investigator, Competitive research funding

自然に学ぶ海岸構造物の自己修復技術に関する研究　　　　　　　　　　　　　　　
平成26年度（第16回）国土技術研究センター研究開発助成
Apr. 2015 - Mar. 2016
川﨑了
国土技術研究センター, Principal investigator, Competitive research funding

自然に学ぶコンクリート構造物の新しい修復・保全技術の開発　　　　　　　　　　　　　　　
NEXCO東日本技術研究助成
Jan. 2015 - Dec. 2015
川﨑了
東日本高速道路, Principal investigator, Competitive research funding

自己修復機能を持つ環境保全型保存材料の開発
科学研究費補助金（基盤研究（Ｂ））
Apr. 2012 - Mar. 2015
川﨑了
日本学術振興会, Principal investigator, Competitive research funding

Research about the maintenance and replacement technique for the infrastructure by using microbes for the littoral region
Grants-in-Aid for Scientific Research
01 Apr. 2011 - 31 Mar. 2014
HATA Toshiro, KAWASAKI Satoru, KIKUCHI Yoshiaki, MORIKAWA Yoshiyuki, MIZUTANI Takaaki, KANEDA Kazuhiro
In this study, a new management method for construction and maintenance technology based on microbial functions was developed. This method can be used to improve soil strength and in-situ water insulation control. This new method was applied and analyzed in a field survey using beachrock from Japan and Srilanka. Further, laboratory tests using artificial beachrock formation were carried out.
Two main results arose from this study. First, it was found that calcium, magnesium, silica, and iron are acceptable as cement substances of beachrock. Further, calcite was found to be the most effective cement substance of beachrock originating from Kumejima Island, Japan, and Sri Lanka. Second, it was found that the bacterium Sporosarcina aquimarina, which is isolated from marine zones, is effective in improving soil strength and increasing soil liquefaction strength.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), 23360207

Standardization of leaching, immobilization, and adsorption experiments for excavated rock samples
Grants-in-Aid for Scientific Research
01 Apr. 2011 - 31 Mar. 2014
IGARASHI Toshifumi, YONEDA Tetsuro, KAWASAKI Satoru, TAMOTO Shuichi
Batch and column leaching experiments using mudstone samples were conducted to understand the leaching processes and mechanisms of arsenic, selenium, and boron. The results showed that two leaching mechanisms, consisting of a rapid leaching related to easily leachable fraction and a slower leaching related to pyrite oxidation, controlled the phenomena. The results of both batch and column leaching experiments can be explained by the two fractions.
Batch and column adsorption experiments for the leached arsenic, selenium, and boron were carried out to elucidate the adsorption processes. The results showed that the leached arsenic, selenium, and boron were adsorbed by not only artificial adsorbents but also natural adsorbents like volcanic ashes when the pH did not change dramatically.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23360202

Self-sealability of fractures in rock and its application to fracture and strength control
Grants-in-Aid for Scientific Research
01 Apr. 2010 - 31 Mar. 2014
KANEKO Katsuhiko, KAWASAKI Satoru, NARA Yoshitaka, ITO Mayumi, MUKUNOKI Toshifumi, HIROYOSHI Naoki, SAKAGUCHI Kiyotoshi, HARADA Syusaku
A series of experimental studies on the sealability of fracture has been performed and its application to geotechnical engineering has been discussed. Firstly, analyzing the influence of environments on the sub-critical crack growth in rock, the mechanism of crack growth has been clarified. Secondarily, the self-sealing process of fracture in the rocklike material in water was investigated and the mechanism of self-sealing was clarified. Thirdly, the process of fracture propagation was analyzed numerically and a design method to control fracture propagation, i.e., crack orientation and so on. From these results, a method to estimate the long-term strength of rock has been proposed. Furthermore it is pointed out that the strength of rock can be controlled by controlling the environmental condition.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 22246114

ビーチロック形成機構に学ぶ新しい地盤固化技術の開発　　　　　　　　　　　　　　　
平成24年度研究助成
Apr. 2012 - Mar. 2013
川﨑了
前田記念工学振興財団, Principal investigator, Competitive research funding

ビーチロック形成機構に学ぶ新しい液状化対策技術に関する基礎的研究　　　　　　　　　　　　　　　
平成23年度研究助成
Apr. 2012 - Mar. 2013
川﨑了
大林財団, Principal investigator, Competitive research funding

シリカを用いた地盤のバイオ固化処理の有効性評価　　　　　　　　　　　　　　　
大学研究支援制度
Apr. 2011 - Mar. 2012
川﨑了
北海道ガス, Principal investigator, Competitive research funding

微生物機能を利用した環境保全型保存材料の提案　　　　　　　　　　　　　　　
科学研究費補助金（基盤研究（Ｂ））
Apr. 2009 - Mar. 2012
川﨑了
日本学術振興会, Principal investigator, Competitive research funding

微生物の代謝活動により固化する新しい保存材料の作製と評価　　　　　　　　　　　　　　　
科学研究費補助金（基盤研究（Ｂ））
Apr. 2006 - Mar. 2009
川﨑了
日本学術振興会, Principal investigator, Competitive research funding

Study on Micro-Restructuring of Rocklike Materials
Grants-in-Aid for Scientific Research
2007 - 2009
KANEKO Katsuhiko, TAKAHASHI Hiroshi, IGARASHI Toshifumi, SATO Tsutomu, MURATA Sumihiko, KAWASAKI Satoru, ITO Mayumi
A series of experimental studies for the micro-restructuring of rocklike materials has been carried out. Various techniques to improve the physical properties of rocklike materials by reconstructing their microstructures have been developed, i.e., a method to change the rock strength by controlling of micro-cracking, a grout technique using microorganisms, a sealing technique using mineral separation from the ground water and so on.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 19206095

寒冷地を想定した低温環境下におけるバイオグラウトの有効性評価　　　　　　　　　　　　　　　
大学助成金
Apr. 2006 - Mar. 2007
川﨑了
北海道ガス, Principal investigator, Competitive research funding

微生物代謝により固化する新しいグラウトの開発に関する基礎的研究　　　　　　　　　　　　　　　
科学研究費補助金（萌芽研究）
Apr. 2005 - Mar. 2007
川﨑了
文部科学省, Principal investigator, Competitive research funding

Fracturing Design Method based on the Fractal Fracture Mechanics
Grants-in-Aid for Scientific Research
2004 - 2006
KANEKO Katsuhiko, HIRATA Atuo, TAKAHASHI Hiroshi, KAWASAKI Satoru, IGARASHI Tosifumii, KATO Masaji
1. The application of a microscopic strength distribution and the fracture process zone can enable representation of the rock fracture process from micro-to macro-scales under an applied load. From these considerations, we proposed a fracture process analysis based on the Fractal Fracture Mechanics. In this analysis, the microscopic strength is modeled by Weibull' s distribution function and the inelastic behavior in the fracture process zone by a strength softening curve. The proposed fracture process analysis was perfomed for various applied pressures to investigate the influence of an applied pressure waveform on dynamic fracture process in rock.
2. From the results of the DT tests and crack path analysis, it was shown that the crack density and preferred orientation of the pre-existing microcracks affected the crack growth behavior. The difference between the activation energies of subcritical crack growth in rock are caused by the preferred orientation of the pre-existing microcracks.
3. A micro focus X-ray CT system was used to visualize the 3-dimensional microstructure of a rock specimen used in the dynamic tension test based on the Hopkinson's effect. Numerous cracks that do not coalesce to form a single fracture plane were observed and the multi-crack growth predicted by the Fractal Fracture Mechanics is confirmed. Furthermore, microstructures of Bentnite-Quartz Mixtures and Fiber-Cement-Stabilized Soils were observed and discussed
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), HOKKAIDO UNIVERSITY, 16206088

Fragmentation controlled blasting
Grants-in-Aid for Scientific Research
2002 - 2003
KANEKO Katsuhiko, TAKAHASHI Hiroshi, IGARASHI Tosifumii, OGATA Yuji, KATO Masaji, KAWASAKI Satoru
(1) The dynamic fracture process in Hopkinson's test was analyzed using proposed finite element method to verify the strain-rate dependency of dynamic tensile strength. It is clarified that the strain-rate dependency is due to the stress concentration and redistribution mechanism in the rock. The rock inhomogenety also contributed to the strain-rate dependency.
(2)The fracture process in one free-face rock was analyzed to investigate the fracture pattern and its mechanism. It was cleared that the fracture process as well as the fracture pattern were affected by the applied pressure-rate. The transition between quasi-static and dynamic fracture process can be estimated by the non-dimensional time defined by the propagation velocity, the burden and rise time of the applied pressure.
(3)A numerical simulation method, coupled the finite element arid the finite difference calculation, to analyze the multiple fracture propagation due to stress waves and the detonation gas is developed. It is confirmed that the detonation gas considerably affects the generation and propagation of the fractures and that he numerical gas-propagation velocity along the fractures approximately agrees with that obtained by the laboratory experiments. It is concluded that the gas velocity along the fracture in bench blasting is lower than the air sound velocity except for the vicinity of the blast hole.
(4)A method to predict the fragment size distribution in bench blasting using numerical and image analyses was proposed. In this method, the fracture process in bench blasting was analyzed using proposed FEM and fragment size distribution was evaluated by the image analysis of FEM result.
(5)Rock fragmentation in bench blasting was examined using proposed method and the influence of blast condition on fragmentation was clarified. It is recognized that the widely spaced blast pattern is effective to reduce the bolder in fragments. Furthermore, it is pointed out that the optimal fragmentation in the field with respect to delay time depends strongly on the gas flow through the fractures caused by the stress wave.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 14350529

簡易反発硬度試験による石造文化遺産の健全度調査手法の開発　　　　　　　　　　　　　　　
科学研究費補助金（奨励研究（Ａ））
Apr. 2000 - Mar. 2002
川﨑了
文部科学省, Principal investigator, Competitive research funding

平成14年度少壮研究者による海外学術研究調査　　　　　　　　　　　　　　　
少壮研究者による海外科学技術研究調査助成
2002 - 2002
川﨑了
日本鉱業振興会, Principal investigator, Competitive research funding

Fundamental Study on Novel Grout Cementing Due to Microbial Metabolism　　　　　　　　　　　　　　　
2001
Competitive research funding

Industrial Property Rights

海岸・河岸保全工法　　　　　　　　　　　　　　　
Patent right, 川﨑了, 宇次原雅之
特願2016-157306, 10 Aug. 2016

グラウトおよび地盤を固結する方法　　　　　　　　　　　　　　　
Patent right, 川﨑了, 秋山克
特許出願2011-35415, 22 Feb. 2011
特許公開2012-172060, 10 Sep. 2012

微生物を用いたカルシウムを含む地盤の固結方法　　　　　　　　　　　　　　　
Patent right, 川﨑了, 廣吉直樹, 島田俊介, 小山忠雄, 寺島麗
特願2006-179162, 29 Jun. 2006
特開2008-008023, 17 Jan. 2008
特許4621634
26 Jan. 2011
特開2008-8023

微生物を用いたカルシウムを含む地盤改良方法　　　　　　　　　　　　　　　
Patent right, 川﨑了, 廣吉直樹, 島田俊介, 小山忠雄, 寺島麗
特願2007-16739, 26 Jan. 2007
特開2008-184741, 14 Aug. 2008
特許4608669
12 Jan. 2011
特許公開2008-184741

地盤改良工法およびその工法に用いるグラウト　　　　　　　　　　　　　　　
Patent right, 川﨑了, 廣吉直樹
特願2005-32156, 08 Feb. 2005
特開2006-169940, 29 Jun. 2006
特許4599611
15 Dec. 2010
特許公開2006-169940

地盤改良方法及びその装置　　　　　　　　　　　　　　　
Patent right, 川﨑了, 廣吉直樹, 島田俊介, 小山忠雄, 寺島麗
特許出願2007-72633, 20 Mar. 2007
特許公開2008-231769, 02 Oct. 2008
特許4517050
28 May 2010
特許公開2008-231769

気泡ボーリング用気泡剤　　　　　　　　　　　　　　　
Patent right, 川﨑了, 小宮国盛
特願2007-27076, 06 Feb. 2007
特許公開2008-190251

微生物による構造物材料の風化加速方法　　　　　　　　　　　　　　　
Patent right, 川﨑了, 武田克史
特許出願2000-48288, 19 Jan. 2000
特許公開2001-200526, 27 Jul. 2001
特開2001-200526

微生物による構造物材料の物性改良方法　　　　　　　　　　　　　　　
Patent right, 川﨑了, 武田克史
特許出願2000-48287, 19 Jan. 2000
特許公開2001-200525, 27 Jul. 2001
特開2001-200525

ワイヤーラインによるセルフボーリング型プレッシャーメータ試験方法　　　　　　　　　　　　　　　
Patent right, 川﨑了
特許出願平10-39367, 20 Feb. 1998
特許公開平11-236708, 31 Aug. 1999
特開平11-236708

土または建造物躯体の処理方法　　　　　　　　　　　　　　　
Patent right, 島田俊介, 小山忠雄, 寺島麗, 川﨑了, 廣吉直樹
特願2006-244593
特開2008-63495
特許公開2008-63495